SAT/ACT preparation – what book(s)/other help?

Hi and welcome to my blog,
I opened this blog to help anyone who is preparing for his SAT.
I remember myself when I started - I was so lost and in such a panic.
Luckily I got this great SAT guide that helped me a lot . So study hard and good luck!
I’m out of school now (1+ years, so no school counselor to consult with this), hoping to go to college next year, but before I do that I want to take the ACT and SAT because I know whatever I scored before (which I don’t even know) is a lot less than I could score if I actually studied for them.
— The next testing sessions are October 10th. Is this enough time in general to prepare and study? Unfortunately I am one of those people who have forgotten 90%+ of things they learned in school (math, specifically) so I’d essentially need to be practically relearning everything. I’m not a speedy learner, but I am quite capable when I apply – but who knows, really..
— So what book(s) should I get? If I understand it right, there seems to be yearly "editions" of prep help books out.. so what’s a good one or does that not matter and is any prep book, as long as it isn’t ancient, good enough?
— And for the likes of me who has essentially forgotten how to do stuff (I never took calculus, for example.. and my science background is pretty much nonexistent) or were never taught certain things at all.. are these books even any help? Will they even matter?
McGraw Hill’s and princeton