Hi! AP Bio Teacher here. Sorry, this is long but I hope it helps!
Where I see my kiddos mess up the most is first lack of basic memorization. There is a whole list of biological jargon you need to be familiar with, ideally to the point where you can pull them out of your brain without some form of prompting. Anki can be good for this.
Second is the application of terms which is what you are probably seeing in your exams. This is where you have to be able to go beyond studying flashcards. I recommend taking notes in class, or if you are an auditory learner recording your lectures and relistening to them on 2x speed. If your class has powerpoints the comment section is an excellent place to take notes because when reviewing the powerpoints you can easily find where you put your notes previously. Someone said this earlier but make sure you star everything that your professor says is important.
SI or if the class has a TA is a great opportunity to get a second person's explanation of a topic if you are having a hard time grasping it. This is also a great place to form a study group (might be hard right now with distance learning, but if you have a class page or a friend in the class that might be a great idea. If you are with a friend you can go through the information and take turns teaching one another, which makes excellent reinforcement.
If group study is not really your thing I highly recommend drawing everything out. Can you relate the central dogma of molecular biology to the different parts of the cell? What about the major metabolic processes? Make a table for everything that is prokaryotic vs eukaryotic. Understand how bonding works and how forces such as pH might affect it. If you understand this then you should be able to predict what might occur when you put an enzyme into a pH out of range, and then explain why that it is. At first, the topics might seem really different and that you can data dump after every unit. Please don't! Biology builds on itself and the really small slowly has an effect on the really big. Being able to go from small to big is huge in understanding how things work! Also if you can always review your previous exams!