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铁板神猴

如果你要听大实话的话：延长备考计划，先踏踏实实解决基本的英语理解问题。

摘录一段国外800分大牛Ron的原话给你，但愿能有所启发：
The answer to this question is definitely of the tough-love style: if your understanding of written English is insufficient for you to comprehend difficult OG passages, then you should take some at least a few months off studying for the test and improve your general comprehension of written English.

so ...
*  if you are having very specific trouble with the rc questions (like “i don't really seem to understand how inference questions work”), then that's perfectly legitimate; those kinds of questions are the entire reason for the existence of companies like mgmat.
* on the other hand, if you just can't handle reading and understanding these kinds of passages yet, then you should postpone your gmat plans, immerse yourself in high-level English reading, and then return to the gmat once your understanding of the passages is sufficient for you to concentrate on the questions.

It's also a very common problem, especially among the demographic that populates this forum, but being very common doesn't make it any less of a problem.