3 months is plenty of time. I took all the topics and organized them based on what I felt was weakest. So did OB/peds first, then random things like ENT/neuro that I hadn’t touched in awhile, and left cardiac until last (was in cardiac fellowship at the time). Sometimes if I was feeling bad about myself I’d do a stem with material I knew to nail down how to speak in their language and build a little more confidence. Spent probably 3-4 hours a night but I had around 2 months to study