GMAT Strategy

Hi

I've given the GMAT in May and scored 620 (Verbal - 28 Quant - 47 AWA - 4.5) I've got 28-32 in verbal consistently before the test day. My main problem areas are RC followed by CR. I seem to narrow down to 2 options easily and pick the wrong one.

Also, I would be on track for a good score till Q no. 33 (around the last RC) in verbal and would get 4-6 Q wrong on a trot Consistently during the test. I don't get enough time for the last 8-10 Q's due to the last RC and have to guess on the same.

My target is 700+ and plan for a second attempt around 20th Sept. I had done the OG, Kaplan Premier, Manhattan SC and Princeton and now seem to have run out of resources. Although I've got the Kaplan Verbal book & OG Verbal book and plan to refer some LSAT books as well for CR & RC.

Kindly help me with Study plan:
1) How much time should be dedicated for Quant and Verbal sections?
2) How frequently to take the practice tests? and which ones? (i had already given Kaplan CD tests, GMAT PP and some GMAT practice paper tests)
3) How to improve timing?

Thanks