Every topic on the interim: Unit 1 atomic structure, Unit 2 periodic trends and Unit 3 chemical bonding. Each attempt draws different questions from a bank of 263.
10 questions from the topics you pick. You see the answer and the reason straight after each one.
30 questions weighted like the real interim: 18 from Unit 1 (60%), 6 from Unit 2 (20%) and 6 from Unit 3 (20%), with a timer. No answers until the end, then a score for each topic and a review of every miss. Aim for 30 minutes and 90%.