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Practice by difficulty

New here? See how practice by difficulty works.

Pick a Part and a difficulty level — based on how many learners answer each question wrong — and we'll build a practice test for you.

Choose a Part
Choose a difficulty level
Questions

Frequently Asked Questions

How is the difficulty level determined?
Each question's difficulty is based on the real percentage of learners who answered it incorrectly, not a guess — questions are ranked into 5 levels per Part.
How is this different from regular practice?
You choose the exact difficulty level to focus on, from easiest to hardest, instead of getting a random mix.
Do I need an account?
Yes — generating a difficulty-based test requires a free account. Free accounts get a daily allowance; VIP accounts can practice without a daily limit.