Fifty questions.
One clear path.

From the first principle to the hardest exam question.

Questions climb from basic to exam-hard: Levels 1–2 are foundations, 3 is core, 4 is HL, 5 is very hard. Tap an answer for instant feedback. Your first answer counts and cannot be changed. When time ends, the test locks and shows your score with every wrong answer explained. A GDC is allowed; answers are 3 s.f. unless stated. Do not refresh during the test. The PDF includes an answer key on the last page.