Great score
@atanasovd, book-wise, there is a whole bunch of suggestion out there. Though other's opinion may differ, I personally recommend taking a practice GMAT first and see where you're weak points are at. Then I'd go and purchase the books that will necessarily attack my weak areas. You can find free test on
Manhattan GMAT, Princeton Review, GMATPrep (2 free tests).
Generally speaking though, you must have OG12 (plus its individual quant&verbal books). OG is published by GMAC, and reflects real questions that you'll see on the test.
Manhattan GMAT books are also something that you can look into.