Since you are struggling with embryology, taxonomy and physiology, I definitely suggest reviewing Feralis's notes as it will supplement a lot more to cliff's. If you are concerned with the QR (math) section, I'd recommend continual utilization of Math destroyer and the DAT destroyer. Additionally, use the new QR questions provided by bootcamp as a resource to up your game for any of those new questions. For my version, those were prevalent so I do suggest reviewing it. It should be a subject specific test with a ton of questions. Practice the PAT daily if you can to up your score some more as well.
For the destroyers, don't get too bummed out about it. It's hard for a reason and it'll definitely help you a lot on the DAT.