CAT

Check the below link-
https://www.shiksha.com/university/cochin-university-of-science-and-technology/cusat-cat-exam-question-papers
You can find some information.

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.

JB,
FMS BHU needs minimum CAT percentile of 85 for MBA programmes.

Hello,
To get admission into a well-reputed college, one needs to give the particular MBA entrance exam (s), clear the necessary cutoff (s), and perform well in the interview rounds. Direct admission is not given to any candidate in any of the top-ranked colleges.
https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india/2-2-0-0-0.

If your basics are good, you can clear it in 3 months.

Yes, CAT exam has no upper age limit.

It is a national level exam to get admission in MBA/PGDM in IIMs. Apart from IIMs, its score is taken into consideration by various colleges around the country.
The exam is conducted once a year in November and its duration is 3 hours with English, reasoning, DI and maths as major topics. It is an aptitude based exam.

There is no information shared by FORE, which would give information about the minimum packages. About the worth of paying INR. 15 Lakhs, MBA colleges tend to be expensive. The fees of any college would be higher than the average package. The worth of joining a course depends on your capabilities, more than anything else.

CAT is an entrance exam for MBA, as MBA is a postgraduate course so it's not possible for student of any stream eligible for CAT just after class 12th one has to get their undergraduate degree first. And, yes students of Science can give CAT but only after completing their undergraduate degree.

You don't need to opt for CAT exam if you want to study law further. After completion of 12th, if you are thinking for law, you may take admission in law school or private university for integrated course BALLB/BBA LLB. It depends that you are want a top law school then you need to sit for CLAT which will be conducted in the month of May. Apply for it and start preparing now to get into National Law University. All the best!
Thank you!