MBA/PGDM

You can get many good colleges with your score. I got into DBS Dehradun and IMT Nagpur with 93.5%ile in CAT.

It's difficult. You should appear for CAT and MAT too.

It's available on your scorecard. The score is total of all the sections and is out of 800.

They are not the same. Both facilitate the MBA program but are different institutes affiliated to different universities. Both of them provide the knowledge and practical application of the same along with academics and other activities.

For NS (Non-Sponsored) category: min. 50% marks in graduation in life sciences
with a minimum score of MAT 500/GMAT-2013 500/ CMAT-150. Percentile in CAT/XAT - 75/NMAT- 60.
Amity Written Test (on the day of interview).
For S (Sponsored) category- min. 50% marks in graduation in life sciences with a minimum score of MAT-450/GMAT- 450/ CMAT.
Percentile in CAT/XAT-65/NMAT- 50.
Amity Written Test (on the day of interview).

You should give entrance examinations for both. Both are very tough to crack, but they offer a really good package.

Learn4exam, PT education, hand ka funda.

If you are interested in Mathematics or Physics, you can apply for M. Sc. from CMI Chennai,for M. Math/M. Tech. in QROR or Cryptology & security from ISI KOLKATA, You can learn any foreign language like French, Spanish, German, Japanese, Chinese etc. You can do certificate and diploma in foreign languages and get a good job.
You have lots of options besides M. B. A. or Job in technical field.
Search for different opportunities.
All the best for your bright future!

As per CAT eligibility criteria, you can apply in CAT for MBA. CAT doesn't specify the requirement for class 12th passing certificate. However, some colleges may have different rules. But, you will be eligible for any PG course after B.Tech.