Hi sethisankalp

In my opinion, if you're reinstalling the same version of the software, the same questions will get installed each time. Thus re-installing does not reduce the probability that you see repeats.

Actually, once you have a test saved, the software 'reserves' these questions so that you do not see them again until you delete that test. So to minimize repetitions, I think you should leave one test alone and retake the other. At least you will be certain that the 37 quant and 41 verbal questions from the test you left alone will not reappear. In the future keep going back and forth: leave one test alone and retake the other, then leave the other alone and retake the first...

If you repeat the process enough times, you eventually see most of the questions in GMATPrep. If you want to methodically go through all the ~1200 questions in GMATPrep, use the Solutions Engine from GMATFix or a similar resource.

My 2 cents,
-Patrick

In GMATprep, are there enough RC and CR questions to practise if one takes GMATprep again and again ?

yeah, but you will begin to see questions repeat themselves after a few tests. It's difficult to get to see all the questions in GMATPrep