1,334 exam-style questions, timed mocks scored like the real thing, worked answers for every question and a study plan built from your results. Written by a certified bell diving supervisor with over 20 years offshore.
Your guide through the ADS, BDS and LST exams. Thirty seconds on how it works, then your first 15 questions are free.
Hide videoOne question at a time, four answers, a built-in calculator. After every answer you see why it's right, how it's worked out, and the IMCA document and section it comes from.
Try 15 more freeMost candidates who fail do so on one area, usually physics or working practices. Everything here is aimed at finding and fixing your weak area before exam day.
Original four-option questions in every area of the ADS, BDS and LST exams, each tied to the IMCA or DMAC section it comes from.
Same areas, number of questions and time limit as the real exam, with an on-screen calculator, scored 75% overall and 70% per area.
See your score by area and topic, track your mocks over time and get a plain-English plan for what to work on next.
Every exam formula in metric and imperial, showing the full working, plus a printable formula sheet.
The current IMCA diving guidance documents, readable in your browser, linked from every answer.
Physics and Gas, Physiology, Air Diving Operations, and Saturation, Bell and Chamber Operations.
Pay once per exam. No subscription. Add the matching books for $49 more.
Fail one area and you fail the whole exam, even with a high overall score. Physics is its own area on every paper, so it can't be carried by the rest. Our mocks score you exactly the same way and show which area would let you down.
| Exam | Areas (questions) | Time |
|---|---|---|
| LST | Physics 20 · Physiology 20 · Chamber & LST practices 40 | 2 h |
| ADS | Physics 25 · Physiology 25 · Working practices 50 | 2.5 h |
| BDS | Physics 20 · Physiology 20 · Chamber 20 · Bell operations 40 | 2.5 h |
No. Every question is original, written from the current IMCA and DMAC guidance documents in the same four-option style as the real exam. That is exactly what you are tested on.
Mainly IMCA D022 Guidance for diving supervisors, the core text for every exam, plus D014, D050, D010, D018, D024, D036, D061, the DMAC notes and over 40 more, checked against their current revisions.
75% overall and at least 70% in every area. Fail one area and you fail the whole exam, so our mocks score you exactly the same way.
Yes. Questions, worked answers and calculators cover feet, psi, cubic feet, Fahrenheit and rankine as well as metric.
6 months from the day you buy, with unlimited practice and mocks. It's a one-off payment, not a subscription.
Yes. Create a free account and answer 15 questions from any exam, with full worked answers.
Press "Report this question" under any question. A certified diving supervisor reviews every report.
No card needed. See exactly how it works.