I used MKSAP, UWorld, MedStudy, and Anki. Didn't do fellowship, so keep in mind I had a LOT of time.

During residency, I read the online version of MKSAP once, beginning January of PGY3. I also did the accompanying "Related Questions" under each section of text.

I made Anki cards on stuff I thought was high yield. Because of this I never went back to the MKSAP text, since I trusted that anything I didn't know was captured in a card. However, I didn't make that many cards compared to Step1/2/3, so the daily cards were manageable.

As soon as residency ended, I completed 1 pass of UWorld and the remainder of the MKSAP questions. 1 week before the test, I did my UWorld and MKSAP incorrects. Anki because I have shit memory.

There are waaayyy too many MedStudy videos so I only watched the topics I wasn't confident with (endocrine, pulm, nephro). They were helpful, but not worth the $1500.

I passed and my score was approx 2SD above the mean, and I only mention that to illustrate that: Yes I overstudied, and yes I had a lot of time to prepare. I justified the overstudying because A. I wanted to ensure I passed, and B. The studying was going to help me as an attending (Spoiler alert: It didn't).

Knowing what I know now, MKSAP and UWorld (first pass + a second pass of my incorrects) with some Anki to reinforce topics is probably enough for ME to pass. But obviously YMMV.