You should first take an AAMC tests to know where you are. If you are getting 5-7, on the science sections, invest in 1001 books.
I am using them currently. They hammer the science into your head, after you do the problems, you not only gain confidence over the material. Furthermore, I have found out that the 1001 book especially the Physics and Gchem have helped me pinpoint my weakness in each chapter.
That being said you should do MCAT passages also as you go through each chapter. I have the PR science review book, so I go over the corresponding passages after I am done doing the 1001 questions. Also make sure you have the AAMC practice items, I am following the EK schedule and they have provide the passages you should be doing from the practice items for each class.
If you have to know the science before you can do passages otherwise its futile. If you need help in science get 1001 books, don't get the orgo 1001 that is not suppossed to be as good as the other two books. But its essential to have the AAMC exams and practice items. Good Luck.
