Hi saleem1992,
Practice CATs are an important part of the study process, but they're only accurate if YOU take them in a 'realistic' way. Since you've admitted to pausing your CATs, you did not take any of them in a realistic manner (since you can't pause the Official GMAT). In many cases, the result of taking an un-realistic CAT is an "inflated" score - meaning that you thought you were doing better than you actually were and you did not have a clear sense of your weaknesses.
If you're going to continue studying for the GMAT, then you MUST put an emphasis on taking your CATs in a way that matches Test Day: take the ENTIRE CAT (including the Essay and IR sections), in a test-like fashion (no pauses), away from your home, etc.
Many Business Schools do accept the GRE score as part of the application process, so it's a viable alternative to a GMAT score. However, if you want to impress the Admissions Committees, you'll still have to perform at a high level. You can download 2 practice GRE tests for free from
www.gre.org if you're curious.
When it comes to studying for either Exam, most Test Takers who focus on a book-heavy approach get "stuck" at a certain point, so investing in some online resources would likely help you to score at a higher level.
GMAT assassins aren't born, they're made,
Rich