Just curious, have you been using AAMC practice tests to gauge yourself? Thanks for your reply!
Yep! I did AAMC 3 as a diagnostic after finish 50% of content from TPR. I did AAMC 4 right after I finished all the content from TPR. I have been using the rest steadily as practice exams.
I would not use AAMC 3 or any of the earlier tests right now to gauge how well Kaplan has prepared you. However, one way to see how you measure up is to look at the questions found at the end of the chapters in TPR. I feel that these questions are very similar to the type of discrete calculation questions on the AAMC tests, if only a bit harder. If you can do the TPR questions, then you can definitely do the AAMC ones. I believe TBR set is almost twice as much as the TPR content review set. If I were you, I would purchase the content review book for the subject you feel the weakest in and see how you do on the questions. If you are doing great having used only Kaplan, then you will definitely not need the rest of the TPR books. And I wouldn't even consider TBR by that point. Not sure if the FLs you've taken are AAMC ones, but here's just what I have to say about the AAMC ones.
Take AAMC 3 after being solid in content. You can expect your score to improve ~5 points as you take more and more AAMC tests. And as many have said on this forum, your actual MCAT score should fall within 2 points of your AAMC average, with the later tests (9, 10, and 11) being the best predictors.
In my opinion, low 20s indicates a fundamental problem in content. So....
tl;dr: Start with TPR content review -> Take AAMC FL to gauge process -> Buy TBR if necessary.
I personally work with information provided in the passages to answer questions. Others use knowledge from content more. If you're more the latter, might as well buy TBR. It will be very obvious after you take your first AAMC.
