Hi RupK23,
To start, a CAT/mock is really a 'measuring device' - when used correctly, it will give you a realistic score and help define your strengths and weaknesses, but it will NOT help you to fix any of those weaknesses. To raise your scores, you have to learn the necessary Tactics and put in the proper practice and repetitions. The CAT will show you whether your studies are helping you to improve or not. In addition, 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 shouldn't take more than 1 CAT per week - and your last CAT should be taken about 1 week before Test Day. Going forward, you really shouldn't take more than 1 FULL CAT per week.
From what you have described, your initial study plan is "book heavy"; unfortunately, many GMATers who study in that way end up getting 'stuck' at a particular score level. Even the best books are limited in what they can teach you; they also can't force you to approach questions in a certain way and their explanations are often one-sided. There's no harm in starting off your studies with the books that you have, but you will likely find it necessary to invest in some non-book study materials at some point. For practical purposes, you might consider studying as you like for the next 2 weeks, then take a NEW CAT under realistic testing conditions (re: take the FULL CAT - with the Essay and IR sections, at the same time of day as when you'll take the Official GMAT, if you will be at a Test Facility, then wear a face mask, etc.). Once you have that Score, you should post back here (or you can PM me directly) and we can discuss the results and how you might best proceed with your studies.
As far as your applications are concerned, each School/Program has its own application deadlines, so if you have a specific list of Programs that interests you, then you should be able to research them individually and find the exact application deadlines/rounds for each.
GMAT assassins aren't born, they're made,
Rich