Some bio qvault questions are super easy and then I find some that are completely out of left field not even in any of my study notes. I have done all 10 tests and got an 18 on my first few test after reading only 50% of barrons ap bio. I then read barrons twice took notes memorized everything and memorized Feralis notes and still got only 18 or 19s on all 10 DAT Qvault tests. I'm going through destroyer and am getting much more correct in Destroyer than DAT Qvault. Should I be worried?