how to get good score in RC

It's hard to answer specifically without knowing more about your situation, but here are a few general points:

1) Practice RC realistically: If the passage is short (<40 lines in the OG), do only 3 questions (6 minutes to read & answer all 3). If the passage is long, do 4 questions (8 minutes to read & answer all 4). If you want to do the remaining questions for each passage, do them separately. First test your comprehension accurately by doing a smaller set, as you will never get more than 4 questions on one passage on the real test. You can choose these problems randomly, or select one general question, one inference, etc. You will generally want to spend about half of your time on reading, and the other half on the questions.

2) Read with two goals in mind. When you're done reading the passage, you want to know a) what the author's overall point is, and b) what purpose each passage serves in the overall plan. When you go to the questions, you want to know where to look to find any answer you need, and you want to understand how that information relates to the author's purpose.

2) When you are asked a specific question, make sure you are able to support your answer with specific text from the passage. What makes this particular answer correct?

3) Strengthen your inference skills. I don't know what materials you're using, but read up on RC inferences and/or CR Conclusions/Inferences. Inference is the key skill in RC. Given the information in the passage, what do we know FOR SURE and what is too big a stretch?

4) Review everything. After doing each timed passage, go back through and determine why every single answer choice is right or wrong. Where is the support, or what is mentioned that is not supported? Pay special attention to the most tempting few answer choices, or to choices that look very similar. What separates these choices? What makes one right and the other wrong? Go through this process *before* checking the answers, and then follow up again as needed after checking. This review process is the most important step in the process. What did you miss the first time through? What could you have done that would have improved your accuracy? Did you understand the passage adequately the first time? Did you distinguish carefully enough between the answer choices? Did you choose answers with clear support, or did you simply try to answer everything from memory or intuition?

I hope this helps!