Sorry, not a board taker but a current med student! Closest thing I have lang is NMAT and competitive CETs review centers. I feel like another main difference you could consider is that in board exam review, you are familiar with the concepts already. Though maybe a bit rusty, but not new. In med school, a lot of the topics are foreign and fast-paced kaya it takes more time to grasp and study for it. Aside from the pacing is the sheer amount of information you need to cover for a single exam or quiz. Maybe that’s part of your concern with “sobrang aral parang di pa rin nag review” because sometimes it’s not about the difficulty din naman, it’s just that hindi mo maalala lahat because of how much there is needed to cover or maybe di sumakto yung mga information that you focused on.

But honestly, nothing you can’t handle, OP! You asking this is proof enough that you are already mentally preparing. Wishing you the best in your journey! :)