Hi khushi0721,
The scoring algorithm on the Official GMAT is far more complicated than most people realize. Since that algorithm is proprietary, no GMAT company has an exact match for it, thus CAT scores can vary a bit based on the 'biases' involved in their respective designs. The
MGMAT CATs are generally regarded as being a little tougher than the Official GMAT, so a slightly lower Score on that one CAT shouldn't be too much of a concern. Assuming that you took these CATs/mocks in a realistic fashion that matches-up with how you will take the Official GMAT, I think you probably have the knowledge to hit 700+ on Test Day.
Since your Official Test Date is now a little over 1 week away, you should NOT be taking too many more CATs/mocks. The process of taking (and reviewing) a CAT requires a significant amount of energy and effort - and takes time to 'recover' from. This is one of the reasons why you typically should not take more than 1 CAT per week - and your last CAT should be taken about 1 week before Test Day. You would likely be fine taking one more (perhaps this weekend), but you should not take any more than that. In addition, in the final few days before your Exam, you should limit your studies to general practice and light review (NO CATs and NO 'cramming') - you would be better served by getting some extra rest so that you can go into Test Day calm, clear-headed and ready to work.
GMAT assassins aren't born, they're made,
Rich
Contact Rich at: Rich.C@empowergmat.com