I am going through my ek set as well, but I decided not to do the 30 min exams first. I am planning to go through the stuff once and then the second time I would supplement each chapter with the 30 min exam. I guess my reasoning is unless you know the science at least to some extent you cant really answer those questions efficiently.
? How many times do you guys go through the chapter before doing the 30 min exam ?
p.s. I just ordered AO to supplement the books, I heard it helps.