- What You Are Actually Sitting: CSWAP-SU, CSWPA-SU and CSWP-SU
- Format, Fee and Logistics You Can Verify
- The 18 Distinct Skills Behind the 19 Listed Lines
- Build the Curve Foundation First
- Boundary Surface vs Loft and the Other Creation Tools
- Repair Skills: Knit, Trim, Untrim, Extend and Move Face
- Knit Surface Failure and Thicken Failure: A Troubleshooting Routine
- Unit, Material and Precision Checks Before You Submit
- Original Practice Exercises to Build Yourself
- A Skill-Ordered Study Plan
- If You Need a Retake: The Timed Recovery Plan
- Frequently Asked Questions
- The exam is 90 minutes of hands-on surface creation and repair, with a minimum passing grade of 75%.
- CSWAP-SU is this site's label; the issuer calls the exam CSWPA-SU, now listed as CSWP-SU.
- The fee is USD 20 in North America for one attempt, and retakes need 14 days plus a fresh exam credit.
- The published coverage lists 19 lines but only 18 distinct topics, because Spline Creation appears twice.
What You Are Actually Sitting: CSWAP-SU, CSWPA-SU and CSWP-SU
Before you spend a single hour studying, get the naming straight, because it affects every search you run. On this site, CSWAP-SU means Certified SOLIDWORKS Advanced Professional Surfacing. SOLIDWORKS, a Dassault Systèmes brand, is the issuer. In its own materials the exam appears as CSWPA-SU in older naming and as CSWP-SU ("SOLIDWORKS Surfacing Professional") on the current exam page. All three labels point at the same surfacing assessment, so when you hunt for a CSWPA-SU practice test or a CSWP-SU exam walkthrough, you are looking for the same thing.
If you are new to the credential itself, the explainer pages What Is CSWAP-SU? and CSWAP-SU Meaning cover the naming history in more depth. This guide assumes you have decided to sit the exam and want a plan that works.
Format, Fee and Logistics You Can Verify
This is a practical exam, not a multiple-choice quiz. You open provided SOLIDWORKS files and do real surfacing work: creating advanced surfaces and repairing broken surface bodies or incorrectly imported bodies. You have 90 minutes, and the minimum passing grade is 75%. Because the files must open in your own installation, you need SOLIDWORKS 2017 or later. That version is a software compatibility floor, not an exam-edition year.
| Item | What the issuer states |
|---|---|
| Task style | Hands-on advanced surface creation and repair of broken or imported bodies |
| Duration | 90 minutes |
| Minimum passing grade | 75% |
| Software requirement | SOLIDWORKS 2017 or later to open exam files |
| Fee | USD 20, North America, one attempt |
| Delivery | Online through SOLIDWORKS/VirtualTester (older material says Tangix/TesterPRO) |
| Retake rule | At least 14 days between attempts and a fresh exam credit |
| Validity | Customer/student certificates carry no official expiration date |
Two honest gaps are worth flagging. First, the issuer links a "Sample CSWP-SU Exam" ZIP from its exam page, but this guide does not describe its contents or question count because those could not be verified. Download it yourself from the official page and treat it as your first diagnostic. Second, no official pass rate has been verified, so be skeptical of any site quoting one; our CSWAP-SU pass rate analysis explains what can and cannot be said. For deeper treatment of cost and scoring, see CSWAP-SU Certification Cost and CSWAP-SU Passing Score.
There are no formal entry prerequisites for Associate or Professional exams, as detailed in CSWAP-SU Requirements. The exam page does recommend SOLIDWORKS Design Essentials, Advanced Part Modeling, Advanced Surface Modeling and its Surfacing exam-preparation course. Those are preparation suggestions, not mandatory course-hour requirements.
The 18 Distinct Skills Behind the 19 Listed Lines
The issuer publishes an exam-coverage list of 19 lines. Spline Creation appears at both the first and eighteenth positions, so there are 18 distinct topics. Important: these are unweighted skills, not 19 official weighted domains and not an exhaustive blueprint. Nothing published tells you that any one topic is worth more than another, so do not build a plan around guessed percentages. The full breakdown lives in CSWAP-SU Exam Domains: Complete Guide to All 19 Content Areas; here is how I cluster them for study purposes.
| Cluster | Listed skills |
|---|---|
| Curves and splines | Spline Creation, 3D Curve Creation, Guided Curves |
| Surface creation | Boundary Surface, Loft/Blend Surfaces, Filled Surface, Swept Surface, Planar Surface, Ruled Surface Creation, Offset Surface |
| Surface editing and repair | Knit Surface, Trim Surface, Untrim Surface, Move Face, Extend Surface |
| Finishing and solids | Fillet, Thicken, Split Solid Body |
This clustering matters because the exam's repair focus means skills combine. A single task might ask you to extend two surfaces, trim them against each other, knit the result and thicken it into a solid. Knowing each tool in isolation is not enough; you need to know the order that avoids failures.
Build the Curve Foundation First
Surface quality is inherited from curve quality. Three listed skills sit upstream of nearly everything else, and Spline Creation is listed twice, a hint that it deserves repeated practice.
Spline Creation
Splines drive boundary, loft, sweep and fill results. Poorly controlled splines produce wavy, hard-to-knit surfaces.
- Practice placing the fewest control points that still capture the shape
- Learn to adjust tangency handles and curvature rather than adding points to chase a profile
- Compare a lightly constrained spline with an over-pointed one by checking the resulting surface
3D Curve Creation and Guided Curves
Many surface tools need curves that live in space, not on a single sketch plane, and guide curves control how a surface behaves between profiles.
- Practice building 3D sketches and curves by projecting or intersecting existing geometry
- Use guide curves to steer a surface and see how it changes the result compared with no guides
- Watch for guide curves that do not actually touch the profiles, a classic cause of failed features
Boundary Surface vs Loft and the Other Creation Tools
The most common conceptual question in surfacing is boundary surface vs loft. Both build a surface between profiles, which is why candidates mix them up. The difference is control. A loft or blend moves between profiles, with optional guide curves. A boundary surface can take curves in two directions and gives you tangency or curvature control at the edges in both. When you need a smooth, curvature-continuous patch that matches neighbouring faces, boundary is usually the stronger choice. When you have simple, well-ordered profiles and just want a transition, loft may be quicker. Practice both on the same geometry so you can feel when each one struggles.
Filled, Swept, Planar and Ruled Surfaces
These cover the remaining creation scenarios you are likely to meet.
- Filled Surface: patch a hole bounded by edges, with control over contact, tangency or curvature to neighbours
- Swept Surface: push a profile along a path, with or without guide curves
- Planar Surface: cap a flat closed boundary quickly, often the last step before a knit
- Ruled Surface Creation: build a surface off an edge at a set angle or direction, handy for flanges and parting-style surfaces
- Offset Surface: create a parallel surface at a distance, and know what happens when the offset exceeds local curvature
Repair Skills: Knit, Trim, Untrim, Extend and Move Face
The exam describes repairing broken surface bodies and incorrect imported bodies, so these editing tools carry real weight in your preparation even though no official weighting is published.
Knit Surface
Knitting joins surface bodies into one, and with the right option it can produce a solid.
- Understand gap tolerance and when raising it hides a real problem
- Practice diagnosing which edges refuse to join
Trim Surface and Untrim Surface
Trim removes unwanted regions; untrim restores or extends boundaries.
- Know mutual trimming versus standard trimming and when to keep versus remove selections
- Use untrim to remove holes or edge loops from imported surfaces that have extra boundaries
Extend Surface and Move Face
Extend lengthens a surface so trims and intersections work; Move Face offsets or shifts faces to correct imported geometry.
- Compare extension types (same surface versus linear) and see how each behaves at curved edges
- Use Move Face for quick corrections, then verify the surrounding faces still blend correctly
The remaining skills, Fillet, Thicken and Split Solid Body, tend to be the finishing steps. Fillets on surface-derived solids can fail where the geometry is tight; Split Solid Body usually turns a surface into a tool to divide a solid into separate bodies. Practice them as the end of a chain rather than on their own.
Knit Surface Failure and Thicken Failure: A Troubleshooting Routine
Failing features are the heart of this exam, so a repeatable routine saves minutes. When a knit or thicken does not behave, work through the same checks in the same order.
When a knit fails or will not form a solid
- Check for gaps. Look for open edges using edge or free-edge display. A single tiny gap leaves a surface body instead of a solid.
- Look for overlaps and duplicates. Two surfaces covering the same area can block a clean join. Delete or trim the extra.
- Extend and re-trim. If two surfaces nearly meet, extending then trimming mutually often yields clean, matching edges.
- Raise gap tolerance last. Using a larger tolerance can mask a modelling error and produce a poor result.
- Fill what remains. A small hole is often best closed with a Filled Surface or Planar Surface before knitting again.
When a thicken fails
- Confirm the body is a single, valid surface. Thickening a set of unknitted pieces tends to fail.
- Test thickness against curvature. A thickness larger than a tight radius causes self-intersection. Try a smaller value to confirm.
- Try the other direction. Thickening inward versus outward can succeed where one side fails.
- Check for sharp or degenerate edges. Slivers and tangent-discontinuous edges can break the offset; rebuild or fillet the problem area.
Key Takeaway
Do not fight a failing feature for ten minutes. Run the same short diagnosis each time: open edges, overlaps, curvature versus thickness, then rebuild the offending patch. Having a routine matters more than any single trick when the clock is running.
Unit, Material and Precision Checks Before You Submit
Surface-repair tasks often end with a property check, and the cheapest points to lose are the ones you built correctly but measured wrongly. Build a pre-submission habit around surface area and mass checks.
- Units: confirm the document's unit system before reading any answer. A correct model reported in the wrong units is still a wrong answer.
- Material: if mass is requested, apply the specified material and check the density being used. A missing or default material gives a misleading mass.
- Precision: increase decimal places in the mass properties display so rounding does not push your answer outside tolerance.
- Surface area: use the evaluation tools on the selected body or face set, and be sure you selected the intended entities.
- Body count: confirm you finished with the expected number of solids or surface bodies; a stray leftover body can corrupt mass and area values.
Run the same check on your own practice models until it is automatic. It takes under a minute and protects marks you have already earned.
Original Practice Exercises to Build Yourself
The official sample ZIP is linked from the issuer's exam page, but its contents were not verified for this guide, so build your own supplementary drills. These are original exercises, not official sample questions.
Exercise 1: Rebuild a Knit-Failure Part
Create a small body from several surfaces, then deliberately leave a gap, an overlap and one self-intersecting patch. Practice finding each issue, fixing it and knitting to a solid.
Exercise 2: Imported Body Cleanup
Export a surfaced part to a neutral format, reopen it, and repair what breaks: missing faces, extra edge loops, small gaps. Use Untrim, Extend, Trim and Filled Surface as needed.
Exercise 3: Boundary vs Loft Comparison
Model the same curved panel twice, once with a loft and once with a boundary surface, matching tangency to a neighbouring face. Record which approach gave cleaner edges and faster rebuilds.
Exercise 4: Thicken Stress Test
Take a curved surface with a tight radius. Thicken it at increasing values until it fails, then repair it with a fillet or by reshaping the radius. Note the threshold so you can recognize it later.
Exercise 5: Split and Verify
Use a surface to split a solid, then compute mass and surface area on each resulting body. Check units, material and decimal precision before writing down any answer.
A Skill-Ordered Study Plan
Generic schedules do not help here; the order of skills does. Curves come first because everything inherits from them, and repair comes before polish because it is the exam's stated focus. Adjust the length to your experience, and see How Hard Is the CSWAP-SU Exam? to calibrate how much preparation you personally need.
Curves and Splines
- Spline Creation, 3D Curve Creation, Guided Curves
- Download the official sample package and attempt it cold for a baseline
Surface Creation
- Boundary Surface, Loft/Blend, Filled, Swept, Planar, Ruled, Offset
- Run the boundary-versus-loft comparison
Repair and Editing
- Knit, Trim, Untrim, Extend, Move Face
- Imported-body cleanup and knit-failure drills
Finishing, Checks and Timing
- Fillet, Thicken, Split Solid Body
- Two full 90-minute timed runs with unit, material and precision checks
If you want a condensed reference to review in the final days, the CSWAP-SU Cheat Sheet pairs well with this plan, and the CSWAP-SU practice test site offers additional question practice to complement your hands-on work.
If You Need a Retake: The Timed Recovery Plan
A failed attempt is not the end. The issuer requires at least 14 days between attempts and a fresh exam credit, which means a new fee. Use the gap deliberately rather than simply rereading notes.
- Days 1-2: write down every task you remember struggling with while it is fresh, and map each to one of the 18 listed skills.
- Days 3-9: rebuild those weak spots as small standalone exercises, with the troubleshooting routine applied each time.
- Days 10-12: do two timed 90-minute runs under exam conditions, tracking where the clock was lost.
- Days 13-14: light review only, check your SOLIDWORKS version and exam-file access, and rest.
Budget the second credit in advance if you can; the pricing breakdown and exam scheduling guide cover how to plan timing and cost.
Frequently Asked Questions
On this site, CSWAP-SU is the label for Certified SOLIDWORKS Advanced Professional Surfacing. The issuer uses CSWPA-SU in older naming and CSWP-SU on its current "SOLIDWORKS Surfacing Professional" exam page. They refer to the same surfacing certification. See What Is CSWAP-SU Certification? for background.
The exam is 90 minutes of hands-on surfacing work, and the minimum passing grade is 75%. Files must be opened in SOLIDWORKS 2017 or later.
The listed fee is USD 20 in North America for one attempt. Retakes require waiting at least 14 days and purchasing a fresh exam credit.
There are no formal entry prerequisites. The issuer recommends courses such as Design Essentials, Advanced Part Modeling, Advanced Surface Modeling and its Surfacing exam-preparation course, but these are suggestions rather than mandatory requirements. Whether the credential pays off is explored in Is the CSWAP-SU Certification Worth It?
For customer and student certificates, no official expiration date is published. No verified pass-rate or salary-uplift figure exists either, so treat any such numbers you see elsewhere with caution.
Success on this exam comes from fluency in repair, not just creation. Build clean curves, choose surface tools deliberately, diagnose failing knits and thickens with a fixed routine, and verify units, material and precision before you finish. Combine that with timed practice and you give yourself the strongest chance of passing on the first attempt.