IB Math AA HL — Hard Mock Set

How to use this set. Every question here was selected because it targets a pattern that trips up strong Korean students specifically — a sign error, a dropped constant, a missing solution family, a domain restriction that got ignored. Read each question fully before choosing. As soon as you select an answer, the correct choice is revealed along with a full worked explanation and the exact trap it was testing. Work through all 20 once without guessing, then come back in a week and do it again — if you get all 20 clean twice in a row, very little on the real Paper 1 / Paper 2 will surprise you. All 20 answers were independently verified twice using symbolic computation (SymPy) plus a numerical spot-check before this set was built, so trust what you see here completely.