I can tell you about engineeringin details.
Engineering: btech is the undergraduate degree available in n many colleges.
You can do btech from IIT NIT IIIT and other state ; government and private colleges.
To take admission in IIT NIT and IIIT you have to clear jee exam with a good rank.
There are some other colleges which have their own entrance exam
Like
BITSAT
VITEE
SRM
IPU CET
AMU etc .
Minimum marks can not be predicted but you can check previous year cut offs just google it.
Different entrance has different cut off for different categories and different branch .
Any other query
Always Welcome.
Good luck.

I can tell you about engineeringin details.
Engineering: btech is the undergraduate degree available in n many colleges.
You can do btech from IIT NIT IIIT and other state ; government and private colleges.
To take admission in IIT NIT and IIIT you have to clear jee exam with a good rank.
There are some other colleges which have their own entrance exam
Like
BITSAT
VITEE
SRM
IPU CET
AMU etc .
Minimum marks can not be predicted but you can check previous year cut offs just google it.
Different entrance has different cut off for different categories and different branch .
Any other query
Always Welcome.
Good luck.

Dear Adhisha

Adhisha inorder to take the admission in the prestigious institution like BARC you need to crack the entrance exam which is also the Gateway entrance exam for these prestigious institutions i.e GATE and based upon your score and rank you can be able to take the admission in the premises of BARC and if you want to pursue the engineering degree then go for the preparation of JEE mains / Advance and based upon your score /rank you can be able to take the admission.

All the best