Pass the CWI exam. Start with the part everyone fails.

Part B is the hands-on specimen test. Plastic weld replicas, an accept or reject call on each, in person, no notes. It has the lowest first-try pass rate of the three parts, and until now there was no way to practice it on your phone.

Try Reject Run — the free Part B drill →

25 real specimen scenarios. No signup to begin.

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The simulator drills Part B visual calls. The complete PassCWI course adds the Part A fundamentals bank and Part C open-book code-navigation drills for D1.1, built with a credentialed CWI. Drop your email and you will be first to know when it ships, and founding members get the best price.

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Why Part B first

• It is the part candidates fear most, and the only one you cannot study from a book on your phone.
• The competition gates specimen practice behind printed manuals and in-person seminars that start in the high hundreds.
• If you can make the call cold, under time, on 25 specimens, the testing center holds no surprises.