MBA Entrance Exam

I dont think so. For one thing, you would find it nearly impossible to get into a highly selective or highly ranked program. That because schools want to assemble classes with individuals who have something to contribute to the overall learning. Without having spent any time in the world of work, you would have little to add to many of the discussions.
Secondly, you would fail to get the full benefit of the MBA experience. Without having experience, you wouldn't see how what you learn has applicability to your effectiveness at work. Lacking that foundation would make a big difference in what you take away from the program and how much of it stays with you.
Finally, the companies that employ MBAs want people who have had work experience prior to getting the degree and the maturity in a candidate that comes from it. So graduating with no work experiencemost likely from a third-tier schoolwill not help your employment outcomes.
By the way, just so you have more inside information on what a particular school offers in its MBA program, you might want to download one of these free in-depth Insider Guides. We have them for the top 16 U.S. business schools. I think that after reading one of these on a school you would most love to attend, you will more completely understand how bringing two to four years of work experience into a program would make total sense.
Start preparing for CAT but give it after work experience

Career Launcher:
About: It is one of the most renounced institutes for CAT preparation.It has both Online and classroom programs which help students to prepare for CAT and other MBA Entrance examinations.
2. Prime Tutor
About: It was established in 1992. The Prime tutor was formerly known as Man ac. It offers long term classroom training programs for CAT and other MBA entrance examinations.
IMS Learning Resources Pvt. Ltd.
About: Being one of the leading institutes for the preparation of CAT and other MBA entrance examination.Its main feature is its classroom training, exhaustive study material, test series as well as personal attention towards each and every student.
Abhyaas:
About: Abhyaas is the institute which emphasise on the age old learning technique that is to apply oneself. It was formed with a motive to create a revolution in present teaching scenario and set a benchmark for others.