Start off with the Kaplan Blue book then, buy the TP, Achiever later on when you mastered the Blue book, first. I got all the above materials. But, TP, Achiever has timers on how long the programs last up to 6-7 mos. Get destroyer if you feel you need more problems to work with on G.Chem, O.Chem, Bio, QR. Addition books, Schuam's bio, chem, organic are good. You'll get overwhelmed when you buy everything at once. I did! Good Luck
Lots of good people on the thread to help you answer any problems your having in any subject.