@raviKansagra149 For step 3 biostats and ethics are testes heavily in exam. Randy neil videos are quite helpful if you are weak in biostats, otherwise Uworld qs and biostats subject review is enough. Try to solve CCS cases early in your preparation period.
@raviKansagra149 Step 2 and 3 is all about clinical knowledge and judgement. Try to build your concepts rather than cramming it. For Step 2 I did a round of Uworld and made my own flash cards to review them. I also did ethics from amboss which was quite usefull.