In order to increase my chances to get a very high score, which is very much needed because my Undergraduate GPA is Low and I mean Low like B-/C+, so I bought some books... you name is Kaplan GMAT Premier, GMAT 800, Verbal Workbook, Manhattan Advanced Quant and more.....but my weakness is in the Verbal section from my past attempts (including one chicken out) and practice / mock exams. I am at 77 percentile in Quant but below 50 percentile in Verbal

The worst is Reading Comp. (which I hate the most -

, Sentence Correction and Critical Reasoning are equally bad. I need some help, so which school is better?
Kaplan?
Veritas?
Or else?
Appreciate all your help.....