Hi soumyadeeppaul1,
To clarify, when I referred to taking a practice CAT, I meant a FULL-LENGTH adaptive CAT from a reputable source such as GMAC, Kaplan,
MGMAT or Veritas. 'Glue-ing together' two ClubTests is NOT the same thing.
Since you've been studying for just a few weeks, there's a question as to how much of the GMAT 'content' you've learned (or not learned) yet. Thus, the first piece of 'general advice' is to not be bothered by subjects that you have not covered yet - AND give yourself enough time to hone all of the skills needed to hit your Goal Score. Trying to 'cram' and 'rush' your studies rarely leads to great results with Exams such as the GMAT.
Beyond that, most missed opportunities on Test Day are due to silly/little mistakes - and those types of mistakes can often be traced back to disorganized or incomplete notes. Doing work "in your head" is the WORST way to approach a GMAT question (it often takes LONGER to work in than way and leaves you open to missing little details and making little mistakes). Thus, you should make sure to write everything on your pad (the information you're given in the prompt, the question you're trying to answer and the 'steps' that you work through to answer it).
GMAT assassins aren't born, they're made,
Rich