CBSE 10th

You have a good chance of admission at IIM- C/FMS and other premium B-Schools. I would suggest you to prepare for current affairs, B.Tech related basics, macroeconomics and some puzzles and mathematics as such for WAT & PI.

Please go ahead with application process. You have progressed in your academic run - 5.4 to 5.8 to 6.7, it is good. Very few companies put "through out first class" kind of conditions in placement. Hurry up - today is last day for BIMTECH application window.

I think, for PGDM, you will receive call.

Yes,you will surely get a call for interview but conversion depends on you. Minimum package to finance fresher is Rs lakhs per annum for 2015-17 batch.

You have chances to get a call from IFMR. Your CAT score is slightly below the usual CAT cut-off of IFMR (i.e. 80 percentile). Based on your work experience and academic profile, you have chances of getting a call.
Best of luck.

Yes, you can, but you can rather opt for BCA and MCA for good career into information technology industry with various roles into business analytics and business intelligence for great career.

It depends on individuals field of interest. Computer Science is a good option if you want are looking for career in engineering. Basics of computers like C/C+ will help you get knowledge of basics of programming. If you are looking for career in Medical field (MBBS/BDS/Nursing) go for Biology. Commerce is also a good option if you are looking for career in Banking, Chartered Accountant, Insurance, Financial Institution.

You have very strong chances of receiving a call since last year's CAT cut-off for PGDM and PGDM-IB was 84% and 76%.

Dear Pravin Jadhav,
Check the following link: The top 10 institutes may not imply as per your profile but you can apply for the remaining:
https://www.shiksha.com/mba/ranking/top-mba-colleges-india-accepting-cmat/2-2-0-0-5822
All the best.