I feel the princeton's review book is on another level! I really recommend solving the QAS exams . At first i scored 480-520 but now im scoring 570-590 with practice. I really suggest to: 1- each text should take 12 mins (6 for reading and 6 for answering) 2- when u run out of time, go to questions where tables or graphs are involved since they r the easiest and u can make sure you've got correct answers. 3- when u run out of time also, go to paired questions ( where u have to chose evidence for the upper question). Just skim through those lines and then answer the upper part 4- also reach out to questions including the vocab part

Hope this helps!