I just read the theory reading material at least once, then I go and storm the QB.
I do 600/800 per day at least, and once all QB is done, I start to do mock exams continuosly (at least 10/15 times per day)...doing so gives me enough peace of mind to have read all questions (at least once) and having met all strange ones during mock exams. Sometime i take notes where i see i get always confused.
Bottom line:
Hit the QB (BGS, AE or whathever suits your CAA exam) and go through it over and over till your brain is bleeding and you see you start to score more than 90% each time you run a mock exam, this will give enough "buffer" for unknown/new question you will for sure meet during real exams.
All the best to all.