Hi soumyadeeppaul1,
That additional CAT Score makes your situation a bit more complicated. The idea that you actually improved 130 points in just 5 days is dubious, so maybe you were just 'unlucky' when you took that 1st CAT (maybe you made a bunch of little mistakes) OR maybe you got a bit lucky on the 2nd CAT (for example, if every time you 'narrowed a Verbal question down to 2 choices", you chose the correct one; maybe you had seen some of the questions before) OR it might be a combination of the two - and your actual 'ability level' is in the mid-500s to high-500s.
To try to clarify this issue a bit, I suggest that you study however you choose for the rest of this week, then take a NEW CAT this weekend. Make sure to take it in a realistic fashion (take the FULL CAT, at the same time of day as when you'll take the Official GMAT, if you're taking your GMAT at a Test Center, then wear a face mask while you take your CAT, etc.). Once you have that score, you should report back here and we can discuss the results and how you might adjust your studies going forward.
GMAT assassins aren't born, they're made,
Rich