varun is on the right track, sunil. If you're struggling with a question type, you don't really get better by just doing tons more questions of that type. If I were trying to play a piece on the piano, but I didn't know how to play it correctly, I wouldn't get much better by continuing to play it incorrectly over and over again.
You actually need to figure out *why* you're struggling and *how" to get better first. Once you have better approaches for answering these kinds of questions, you can then test yourself with new questions in order to see whether you really have improved. But you don't improve (much) in the act of doing bunches of new questions.
For instance, for RC, read the below two articles. Are you doing these things already? If not, go back and practice these techniques
using passages that you have already done in the past. Only once you feel you've made progress with the technique should you go and try it out on new passages.
http://www.manhattangmat.com/blog/index ... p-passage/http://www.beatthegmat.com/mba/2010/07/ ... rc-passageAfter that, read these articles and do the same thing - use old problems to really study the process and understand how each problem type works.
Then, test yourself on new problems.
http://www.beatthegmat.com/mba/2010/09/ ... prehensionhttp://www.manhattangmat.com/articles/a ... estion.cfmhttp://www.beatthegmat.com/mba/2010/11/ ... il-problemDo you understand how what I'm describing is different from what you've been describing? If so, please describe it back to me in your own words. If not, please ask questions.
Re: new questions (when you get to that point), first, set aside some old questions right now that you haven't done in a long time. Don't look at them at all for a while - just so you'll forget more about them. You may be able to use them again later.
You can also go back to older versions of the OG. Right now, we're on OG12 and Verbal Supplement 2nd Edition. You can typically find used copies of OG11 and VS1 online. A lot of the questions overlap, but some don't - plus you'll have forgotten some of the ones that do overlap.
Be really careful going forward not to use up all of your new, good questions. As you've discovered, there isn't an unlimited supply of good questions. If you study in the way that I'm describing above, then the question supply is adequate. If, however, you try to learn simply by doing lots of questions, you're going to use up the questions without actually learning as much as you want from each one.
You may want to read this article:
http://www.beatthegmat.com/mba/2011/09/ ... e-mistakes