Hi kanak2016,
To start, many Test Takers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you've been studying for just one month, then you should not expect to have mastered any of the concepts just yet. You do bring up an important issue though - and periodic review of topics that you have already worked through is an important part of an effective Study Plan. If your current Study Plan does not account for that additional review time, then you might need to invest in some new materials that have that type of review built-in.
Before I can offer you any additional advice for your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) What study materials have you used so far besides the books that you mentioned?
2) How have you scored on EACH of your CATs/mocks (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
3) What is your overall goal score?
4) When are you planning to take the GMAT?
5) When are you planning to apply to Business School?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich