Diagnostic
Written in the AP Calculus BC exam's format and at its difficulty: the multiple choice for every unit you've learned, then free response if you want it. It runs like the exam: Part A without a calculator, then Part B with one, each on the AP clock. You’ll see exactly which topics you’ve got and which to work on first. The clock pauses whenever you leave the page, and picks up where you were when you come back.
It’s free. Your results build your study plan, so the diagnostic needs an account: it takes a minute with Google.