Sorry if this is a really novice question of me, but can anyone explain to me how each of the above are supposed to be used? Do any of the above offer topical questions (e.g. not full test format, just questions on individual subjects), or are they all in practice test format? For example, I want to use Destroyer in conjunction with some the above to test my subject knowledge (and practice PAT) before I start taking full practice tests, but I don't want to see those same questions showing up on the full practice exams because then I will get those right out of memory alone, and if that's the case I'd rather save them for use as full tests.
So do any of them offer topical questions AND separate questions for full practice tests?
Here is what I would do:
1. Start with content review and read over cliffs, do chemistry and organic
2. Do the Destroyer problems. It will be challenging at first, but it will be a learning experience. Make sure you do not memorize the answers, but understand the concepts behind the correct answer. For biology, do not just read the solutions, but study them.
3. In conjunction with the Destroyer you should do qvault to boost your confidence and see where you stand
4. One month prior to your exam you should start reviewing for the PAT section. If I had to choose between cdp or achiever, I would go for the achiever. The achiever is amazing at boosting your PAT and RC scores. Get achiever even if you only need it for those two sections. It is an investment - trust me on this!
5. KEEP reviewing and do not underestimate the reading or QR sections.
DO NOT SLACK TWO WEEKS BEFORE YOUR EXAM AND DO NOT POSTPONE!
As for topscore, it is pretty pointless IMO.
For summation:
The sciences: DAT destroyer and qvault (for biology add Cliffs biology [the yellow condensed version])
For PAT: achiever (get CDP if affordable)
For RC: achiever
For QR: DAT math destroyer
Best of luck studying!
Also, I never took a full length exam. My first experience was at the test center.