Congratulations!! You made it to med school..
Before proceeding directly to the answer, there’s something I’d like to tell you.
College is a completely different place. You can’t even for once compare it with your school life. Same goes for the manner of studying. Up until now your primary aim would have been to get as much marks as possible. But now things will get different.
Till now you would have tried to cram up everything you could find regarding a particular topic. But now considering how vast the subject is.. you just can’t expect to know everything. No matter how hard you study a topic.. there will always be someone who will tell you something new about it. So no need to feel discouraged or question your capabilities.