CAT Preparation

It is more than enough. U just need to give 6 hours a day. Just follow the following steps.
DILR
Do as many DI-LR sets for practice. Do solve all the questions from CAT 2001 to CAT 2008. The more you expose yourself to different types of DI and LR, the better it would be. Apart from the CAT papers, solve the questions from your prep material.
VRC
There are two types of VRC questions:
1. Those that are based on knowledge - Grammar & Vocabulary based questions
2. Those that are based onunderstanding of paragraph(s) and logic- Reading Comprehension, Para Jumbled, Para Completion, Para Summary, Critical Reasoning
Of the above two, the latter is something that you must get a strong hold of. Since it is not based on prior knowledge, practice can help you score high. Focus on accuracy.
Quant
This is probably the tricky part. I would suggest that you ensure that you know how to solve almost all of Level 1 questions. That would mean that you must have the basics of all areas in place. Then, look at doing depth in a couple of areas. If I look at the past CATs, Number Theory & Algebra dominates the CAT. There is a bit of risk attached to picking & choosing Quant topics.
In any case, use your Mocks as a strong prep tool. Analyse each Mock thoroughly and let mock tell you what areas you need to work on.
ALL THE BEST!

Hello! Yes, you can take a gap after graduation to prepare for CAT(many freshers prefer it every year); nothing wrong with it. However, it will be better if you do something productive during this gap time(e.g. internship, certification courses, etc) which will highlight your interest in your desired MBA field. The reason for this is, CAT preparation normally takes around 3-4 hours on a daily basis only. And you might be asked about what else you did apart from preparing for CAT and/or other exams, during the PI round. And, of course, it will also help in building up your resume; giving you an edge over the other freshers during the highly competitive admission process of the various colleges.