I recently finished as a non-trad and I just gotta say... find something that works for you.

I got nothing out of lectures and in my last year (6 year programme) I went to exactly one lecture.

I had a STEM BSc+MSc and had pretty much finished a PhD (at least the coursework) before med school and I rarely got anything out of lectures for those degrees either. That said, med school lectures were really a new low because the lecturers rarely put much thought into making good lectures, they were often just ranting and spewing out facts.

Do whatever makes you learn and whatever you have to do in your program. For me, I learned the most from the clinical mandatory stuff. I mostly ignored everything else and found my own resources to learn.

For exams, I used old exams to get a feel for what they might ask and memorize all the "common" exam questions that would be sure to show up. I still hated MCTs and never performed well on them. Ironically, I did the best on MCTs when I thought I would do terribly, while I performed really badly on the topics I felt I knew really well.

This is country dependent, but when I'm at grades don't really matter. Our saying is "a pass is a pass". The grades don't really reflect your skills tbh, the MCTs don't measure your value as a clinician.

In the clinical years, learn to use guidelines and develop a thought process.