Ok well first step, check out the foundations of math book by Manhattan. That is the one that I was referring to that I liked when I was starting to study. It covers all of the basic math principles and question types that are on the test, at a basic level. It sells for about $16 on Amazon and I believe it gives you access to the Manhattan practice tests which are pretty good. As for Verbal, maybe someone else can recommend an introductory verbal book. I know manhattan has a Foundations of Verbal book but I never used it so I can't comment on it.
Next step I'd recommend taking a diagnostic practice test. Most good practice tests will give you a detailed report of what you missed including question types, difficulty etc. Analyze that data and figure out what you are most lacking and focus on those concepts. Maybe buy the individual
Manhattan books for those concepts. The numbers properties guide is a great one in my opinion. It's not very long, and the material applies to many question types. For verbal I'd suggest doing the SC guide as sentence correction is very easy to learn so you'll see immediate dividends.
And as I suggested before, get your hands on the
OG's. They are in order of difficulty starting with the easiest. So just start at the beginning and work through them, or the Manhattan guides will give you suggested
OG problems to practice after each concept you learn. If you can't figure out how a question is solved, jump on the forums here and people are happy to walk you through problems.
The point of all of this is to get a very solid foundation. Don't even bother to look into tougher concepts until you've mastered the basics. The test as you know is adaptive so you won't see 700 level questions if you are getting 600 level questions wrong.
Finally, I always harp on timing. When you do your practice tests, watch your timing and pace yourself. Getting thrown off on the timing can be a huge detriment to your score. Get to used to spending 2 minutes per question. If you aren't sure what the answer is after two minutes make an educated guess. The test has a timer so write this on your pad before you start and use it to stay on pace.
5 - 65
10 - 55
15 - 45
20 - 35
25 - 25
30 - 15
35 - 5
The first column is the question number, and the second column is how many minutes you should have left on your timer. Trust me this is something easy to do that will really boost your score.