Class 11

Everyone see this phase. I too failed my chemistry exam in class 11th because I was too much active in professional cricket rather than studies, the only way I got out of the situation was by scoring in my re-test or else I would have to repeat my class 12th
I would recommend you to become a bit buttering type person with your teachers especially in the exams you failed and then ask them to help you out for a couple of days for your doubts and be friendly and eager to learn they, then they will surly help you to get through and give you marks in the re-test.

Which stream have you chosen?

Earn a Bachelors Degree :
It is also good to have a Bachelors degree in mechanical or electronics engineering and there are many other concentrations in robotics. The basics of electronic components will be taught in the electronics engineering programs. There are various applications of electronics like computing, radio communications, industrial control systems and you will learn about it.

Please checkout the given link:
https://www.shiksha.com/university/sharda-university/exams/Surat
Some good books you can refer for preparation:
Concepts of Physics (Set of 2 Volume)H C Verma
Problems In General Physics I E Irodov
Handbook of PhysicsNipendra Bhavnagar
Chapterwise Topicwise Solved Papers Mathematics for Engineering Entrances B. L. Sharma
Problems In Mathematics with Hints and Solutions. Govorov, P. Dybov, N. Miroshin, S. Smirnova
Problems in Physical ChemistryNarendra Awasthi
General Aptitude: Quantitative Aptitude & Reasoning GK
Quantitative Aptitude for Competitive Examinations-RS Aggarwal.

If you have given CET then only the admission is possible. Class 12th result is mandatory to get admission. Please visit www.ipu.ac.in for other details.
Thanks.

You can choose any subject of your choice. Studying with arts can also help you a lot for PC's.

Just start studying it from the basics. You will understand the basics, your interest will start developing.
Good luck.

Yes, you can get admission but you have to give the entrance exam of the college.

Hi, you can't deny the fact that NCERT books are best. Try to solve numerical etc. from them, but according to me theory cannot be learned much from NCERT (especially physics), but you can totally rely on NCERT for chemistry.
And, when you talk about reference books, according to me, you can go for Nootan-Physics (both CBSE and ICSE) R D Sharma or R S Aggarwal (CBSE) and M. L Aggarwal (ICSE)
Thank you.