For math, the Manhattan GMAT guides are the ones I recommend and use for students aiming at intermediate scores. They are very detailed. Once you buy a MGMAT book, it will give you access to their 6 CAT exams.

Have you solved the Princeton Review books with 1037 problems for GMAT and 1014 problems for GRE? They are excellent collection of problems and of all prep company problem collections, resemble the style of the original exam problems most. You should know that they have typos (like every 15th problem I would say). The solutions in the books are also not so great because they always plug in numbers, even if the problem can be easily solved with a little algebra.

I don't tutor verbal but my students tell me Veritas books are better in that area than Manhattan.