The most important thing about RC is understanding what you read. Being able to read fast is also important, but remember that speed is always secondary to understanding. Below are some tips for exam-preparation as well as for general improvement.

Don't rush yourself. It is natural that you will start a little slowly and then build up speed as you gain familiarity with the passage.
Read all the questions first (if the exam format permits this). This will help you zero in on the relevant portions when you start reading the passage.
Read actively. This means, try to anticipate the next sentence. Reading this way will help you engage with the passage more closely.
Make notes to capture the essence of each paragraph within the passage. The first sentence of the paragraph usually conveys the main idea or theme of the paragraph.
Don't try to memorize anything. Memorizing consumes time and is not very useful.
Practice a lot of Reading Comprehension questions online from sites like www.lofoya.com/Verbal-Test-Questions-an ... /intro.htm ,www.rhllschool.com for free.
all the best!!

deepak sood wrote:Friends,
I am new to GMAT.I had just started preparing for GMAT.So anyone can advice me how to prepare for reading comprehension.I have only 2 months

The best advice I can give you is to read as much as you can. The RC passage are extremely boring and sometimes the fact that the passage is so boring causes you to miss important details because you're just skimming.

Before your test, like shirru said, find as many practice problems as you can- read those passages and get used to how boring most of them can be. Along with that, you'll get an idea of the types of questions that will be asked. Experience with RC questions is important because it will help you better understand what to expect on test day.