CBSE 12th

As you rank in Mains and Advance is quite good, I suggest you to go with all the spot round counselling. Definitely, you will get a Government College, because last year my friend got 105 marks in JEE Mains, and he got admission in IIT Bhubaneswar.
But, as your rank is quite good, so I thought that you will get an awesome college, but go with the spot round counselling.

NIT-Mizoram is the best option for you at this score.

In order to pursue a Bachelors degree, you need to pass your class 12th for any college. So first, pass your class 12th and then you can pursue your desired degree from the college.

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.

Firstly, you should complete your undergraduate education in BCA (Bachelor of computer application) after that you can do your PG in MCA through which you can get hired by the companies with a good salary package. The package will depend on your knowledge, experience and skill set.

You will not be able to get any A-grade DU affiliated college but you may go for any B-grade or C-grade one.

If you are from Delhi or have done your high school from Delhi, then it will be easy for you to get a seat there.
You may get a seat if you are from outside Delhi too but there are only 6-7 seats in here. But you may try for the counselling.

Here ate the courses which you can pursue after class 12th commerce:
Bachelors in Economics
Bachelor of Business Administration BBA
Bachelor of Management Studies (BMS)
Chartered Accountancy (CA)
Company Secretary (CS)
Cost and Management Accountant (CMA)
Certified Financial Planner (CFP)
Bachelor of Law (LLB)
Here are the colleges:
Shri Ram College of Commerce, New Delhi
Lady Shri Ram College for Women, New Delhi
Christ University, Bangalore
Loyola College, Chennai
Hansraj College, New Delhi
Hindu College, New Delhi
St Joseph's College of Commerce, Bangalore.