Undergrad: Never missed a lecture. Used paper notecards, reviewed them multiple times before the exams
Pre-clinical Med school: Skipped lectures because they were recorded and I could play them at 2.0x the speed on my own time. Made Anki notecards with Image Occlusion 2.0 mod (one time I made 500 notecards in 30 minutes). Then during second year put all school lectures on the back-burner by cramming them in order to to study for Step 1 (reviewing Qbanks, Pathoma, First-Aid, and other study resources).
Third year: Realized anki was a waste of time and I was always too tired to retain chapters of my textbook. Just studied using Qbanks, fortifying weak areas with Step Up To Medicine and NMS Surgery. Unlike Step 1, clinical clerkships lack a sole resource to study from (everyone has their own style). Here is what I used:
IMED: SUTM, UWORLD
Surgery: NMS Surgery, Pestana, UWORLD
OB/GYN: uWISE quizzes only
PEDS: BRS + Pretest
Family Medicine: Chapter 12 of SUTM (Ambulatory Medicine)
Psychiatry: First-Aid for Psychiatry Clerkship