Hi Teitsuya,
I'm sorry to hear that Test Day did not go as well as hoped. To confirm what you stated in your first post - did you see an RC prompt on the OFFICIAL GMAT that you took last week that you also saw in some PRACTICE GRE materials? Can you provide a link to that prompt (it might actually be posted here on GMATClub)?
Before I can offer you the specific advice that you’re looking for for this next phase of your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs/mocks (including the Quant and Verbal Scaled Scores for EACH)?
4) What was your Score on the Official GMAT (including the Quant and Verbal Scaled Scores)?
Goals:
5) What is your goal score?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich