In my opinion, Kaplan is worthless. There are so many mistakes in that book. If you do get that, get an older version so it's less expensive and you can use it as a practice test.
CHADs VIDEOs!!! That is all you need in a time crunch for math, gen chem and o chem. it's all I used and raised my AA and TS from 18 to 21 with Chads. There is a fast play option that helps with time and practice quizzes. Watch through all of those videos, read a high school AP bio book, that's all I did for bio, I'm a bio major.
PAT use destroyer.
This is all I used. I studied for a month and a half while planning a wedding and going on a honeymoon for a week two weeks before I took the test. No studying allowed on the honeymoon obviously.
It will be hard in that time crunch but doable of yo work hard enough and are good enough of a student to begin with.