Sentence Correction

I have been following this site ever since I took the GMAT test a few months back. I scored a horrible 480 (first attempt). Prior to the test, I studied for 3 non consecutive days and was not aware of topics to be covered (prior to studying). This is all new to me, but I am taking another attempt at this test-- 3-4 months down the road.

I've got a few books on hand (compared to the one I had for the first attempt).

GMAT Review 10th e.
Princeton Review 2010
Kaplan Advanced
Manhattan SC

Any other recommendations?

I got nailed on the verbal section of the GMAT. I plan to focus on this section for the next round. I hope 3 months of study time is sufficient to score >620.

I believe you should post in strategy section