CAT

You would basically need to join a crash course now (if you feel like you can't prepare on your own). But in case you are the smart one and think you can practice by yourself - then do so. Nothing better than giving hours and hours of smart work (not hard work) by yourself to CAT preparation. In case, you are also shortlisting the colleges to apply at right now only, then it is a great decision. Organized planning gives better results. I would suggest that LM Thapar School of Management is a must-try. Like you can at least try exploring opportunities and resources present in this Punjab based MBA college. As they have a lovely course curriculum and very helpful faculty. I love the fact that they have a huge luscious green campus to chill within. My cousin studied there and got a good rate of success in placements. The companies coming in like Nestle.
You can apply for admissions here, admissions open now - http://lmtsm.thapar.edu/admissions/apply-online.php.

To do MBA, you must have 50% marks in graduation (any stream). Apart from this, you need to clear any national level entrance exam such as CAT/ MAT/ XAT/ LPUNEST/ NMAT/ CMAT/ GMAT. After qualifying written exam you have to go through GD or PI. Many colleges offer this course in India with different specializations. You can choose any specialization as per your interest. Even you can go for dual specialization. I am mentioning a few of them:
Specializations:
Oil and Gas Management
Hospital and Healthcare Management,
Supply Chain and Logistics,
Tourism and Hospitality,
Financial Markets,
Finance,
Marketing,
Human Resources,
Business, Operations,
Information Technology,
Retail Management,
Strategy,