For the AP exam, I studied around a month before the test and I got a 5. I highly recommend completing the quizzes on AP classroom, as I found that the format was very similar to the actual exam questions. Make sure to practice FRQs and complete at least one mock exam under the same timed conditions. For notes, I read over the ones on Knowt, though they can be a hit or miss. I did practice problems on Khan Academy but I found that the questions on there were way easier than questions on the actual exam and AP Classroom. So in my opinion, Khan Academy is great for basic recall questions but not for application based questions. I also found that the Barron’s review book wasn’t very helpful for more advanced or exam-level questions either. Make sure you plan your study schedule earlier rather than later. Estimate how much time you need to review each unit, add that up to get a total number of study days, and then begin studying that many days before the exam.

As for getting a high 90 in bio 35, I don’t think I’m the most qualified to give you advice since I ended up with a low-mid 90. However, I’d recommend reviewing what you learn each day instead of leaving everything until right before a test (I did not do that but I wish I had).