You should speed up your SC as much as you can so you can free up time for RC.
RC will eat up time, especially if you are a non-native English speaker. Two strategies include:
1) Figure out how to read quickly and still understand the passage.
--Note that you can aim to do this, but it's difficult to guarantee you'll actually be able to read it quickly on exam date.
2) Speed up SC and CR.
Many SC questions can be done in <20-30 seconds--IF you know how to spot what is being tested. There are certain tricks to SC to help you speed up. But with RC--it's less about tricks and more about smart tips. As an example, please see these RC videos: http://www.gmatpill.com/practice-questi ... -guide-rc/
You can also take a full-length practice test here: http://www.gmatpill.com/gmat-practice-t ... ctice-test
... and more
What's Inside GMAT Pill?
Zeke Lee, GMAT Pill Study Method (Study Less. Score More.)
GMAT Pill Reviews | GMAT PILL Free Practice Test