CAT Eligibility

Yes, definitely, you are eligible for getting admissions in MBA and your score is quite great. You can get into tier 2 B-Schools.

You need to work hard and ensure that your overall percentage in B.Com is over 50%. Since 50% is the minimum admission requirement for MBA in absence of it will be difficult for you to appear for CAT. So please focus on your studies and get more than 50% marks in B.Com.

You have scored very less; you are not eligible for an MBA college. You need to score at least 70% to get admission in top MBA colleges.

Since you will be eligible to give your CAT exams in your final year, so it would be better if you start your preparation from the second year of your undergraduate study itself. For preparation, there are various books available in the market and/or on the internet, you can refer to those or if you need extra help then you can probably join coaching classes for CAT preparation.

It totally depends upon your CAT percentile and then, the college will call you considering the percentile they accept for admission.

CAT eligibility criteria
CAT eligibility criteria refers to the minimum educational qualification one must have to be able to apply for CAT. Eligibility criteria for admission through CAT may be different and specific to the institute. A CAT aspirant must be a Graduate with minimum 50% marks in aggregate or equivalent from a recognised university
The CAT aspirant must have completed education uptiill Graduation in 10+2+3 mode
Candidates in their final year of Graduation are also eligible to apply.

Qualifying Exam: Candidates must have a Bachelor's or its equivalent degree. Minimum Marks: Pass the above exam with at least 50% marks or equivalent CGPA (45% marks for SC/ST/PwD categories). Appearing candidates of the final year of Bachelor's degree/equivalent qualification examination can also apply.

Yes, CAT exam has no upper age limit.

To get a call from TSM, 70 percentile above score in cat is required. However, TSM also considers the scores of CMAT / MAT/TANCET scores. These exams are comparatively easier to score well.

Scholarship depends on your percentile in your entrance exams & majorly on college. You can also show them your sports achievements if you do have. It's an add on to the plate.