CBSE 12th

Your HSC board exam doesn't matter for engineering college, you have to qualify for the entrance exam of engineering college.

It will depend on the field which you want to choose or which field/subject you are interested in.

Dear,
There are a lot of options in which you can make your career but choose the field according to your caliber and interest.
Fields are:
English (Hons)
BALLB
International relations
Psychology
Philosophy
Sociology
Foreign language
Journalism
Fashion design
BFA animation or visual communication
All the best

To become a space scientist, you need to get admission into an institute offering B.Tech in aviation/aeronautics. You need to clear IIT-JEE Mains and Advanced to get into IITs or IIST-Trivandrum.

You do stand a chance of getting a call. Work experience, extracurriculars add a cherry on the cake.

If your CAT/XAT scores meet our minimum requirements (75%+ in all sections and 85%+ overall) then SPJIMR can accept your scores in case you register for PGDM admissions. Further, for the graduation and higher secondary scores, we don't have any specific cut-off. A decent profile is what SPJIMR looks for in a candidate.

Unfortunately, you can not get admission in any government college for BE CSE based on your 12th board marks. Admission is on the basis of JEE Mains score.