I am at the DFW airport waiting on my plane to Cancun. My gf and I are waiting in the lobby and it is hard for me to sleep. So I want to give you all a tip that I found useful for RC.
When you read the passage, do not waste too much time taking notes or predicting questions. There is actually only a handful of different questions that the GMAT asks for. For example, it is guaranteed that you will have at least one question that will ask for the main purpose of the passage. If you are an international applicant and English is not hour native language, you may not be familiar with the verbs in the answer choices. Let's say that the five cerbs are
A) to explain
B) to compare
C) to qualify
D) to advocate
E) to refute
There are a few more reasons but these five make up a large portion. When working on RC, work through OG and GMATPrep by question type. Find ALL the author purpose questions and do them as a group. Write down the verbs and familiarize yourself with their meaning. You can complete all of this in 5 hours or so. This is a very intentional way of preparing for RC. Once you are done, you can move on to another type. Just as it is a good idea to solve quant questions by subject so should for RC. Do not practice RC by passages but by question type.
Hope this helps!