Repair questions ask which change rescues an argument: the minimal fix that restores validity without altering the conclusion. Options offer extra premises, weakened claims or corrected steps — only one makes every line follow. Test each candidate by re-running the proof with the fix inserted.
Beware fixes that prove a different conclusion, smuggle the conclusion as a premise, or over-strengthen into falsehood. The right repair is surgical: smallest change, full validity.
Study method: attempt five timed questions, log every miss with its topic code, redo misses from scratch within 48 hours, then re-attempt the topic a week later. Pair each hub with its drill link below and a fortnightly full mock.
Place this topic in the wider test with the syllabus checklist and Paper 1 vs Paper 2, learn the timing system in how to prepare, and check what scores mean in scores explained.