What do you mean by trick? You mean Step 3 Trick? It is a trick where you will be able to tell a few days in advance whether you passed or failed in step 3 before your report is out.
For FA? I did not use Step 3 FA. just browsed Step 1 FA for certain topics (e.g Stats, pharma, and a quick review on some systems) bulk of the review from MTB 3, Uworld.