Engineer

You need to appear for JEE Mains exam.

You can check the below-mentioned links:
https://www.shiksha.com/engineering/exams-st-2

To pursue robotics, you need to go for Masters in robotics and automation, which is offered by few colleges across India including some selected IITs and NITs.

Nano technology do have future scope. There are newer technologies in medical imagining based on nanotechnology. Petroleum as we all know is a non-renewable resource, but still there are many parts of world known to have oil reserves, which are still unexplored.

Hello Manthan,
As per me, you should appear for individual state examinations (OJEE in Odisha, EAMCET in Andhra Pradesh/Telangana, ComedK in Karnataka etc.). These exams also guarantee you good colleges and serve as a backup.
More the entrance examinations you appear for, the more the options you will have for choosing colleges.

DPELS stands for diploma in practical English and life skills so the word like skills shows that it does cover Personality development. WISH YOU LUCK!

Yes, you can definitely pursue computer science engineering if you had PCM + economics in class 12th. If you wish to pursue a career in computer science engineering, you must apply to one of these colleges for bright future:
IIT's
PEC university of technology, Punjab
Bengal institute of technology, Karnataka
UTM, Shillong