I go through questions (and review them) fairly quickly- usually a block of 50 I'll do questions and explanations in about an hour. What I do is mark the questions as I do them- if I know the right answer without any doubt, I'll put a little check mark, if I think I know but I'm not sure it gets a ?, if I have some vague sense I heard it once but can't remember it gets "??", and things I've never heard of get a circle. Then when I'm reviewing, for the check marks, I just skim the explanation quickly to make sure I'm thinking along the right lines. The others I spend more time with- I read through the explanation for the "?"s, read and underline or write notes for the "??"s, and the same for the circles, as well as going back to re-read the question to make sure I get it. I also keep a pad of paper next to me while I'm reviewing where I write things down that I want to look up- anything from "what class of drug is cefepime?" to "glucose metabolism"- and wait until I'm completely done with reviewing that block before I go to other sources to look things up.
Disclaimer: This works great for paper-and-pencil questions, not sure how many ways there are to mark things in qbank, so when I start that I may modify.