You don't really need them for step 2 unless you didn't do your 3rd year in the US and didn't take shelf exams. Most people just do USMLE World for step 2 and read either secrets or first aid for step 2.
This is of course after studying for each of the 7 main clerkships (FM, IM, Psych, OB, Surgery, Peds, and neuro) using various study guides during the year.
If you are an IMG and feel your background is weak, think about reviewing some of the review books out there for the clerkships, especially step up to medicine.
