CBSE 12th

Please go with this link. This is a college predictor. I hope this will help you-
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Thank you

You can continue your 12th with some open institute and you can join some technical work like computer application or web in private institutes.

It is your choice. You should go with what you like. If you are a science student then you can go for engineering, B.Sc. Explore the world of science, space and technology. After graduation, you can do higher studies and learn more or you can go for the jobs and different opportunities available whether it is teaching, military, science, civil services, banking, management, etc.

Your marks are very good. However, I will suggest you to follow your interest. Can you tell me this 98.64 percentile is of what?

You need to clear all your backlogs before applying for a Bachelors programme in any college or university.

Hi,
Yes, you can get admission in B.A. LL.B. courses, as you have already completed your intermediate in arts subjects. There will be no problem at all.

Hi,
Yes, you are eligible to take admission in Law School University of Jammu with 67% marks in class 12th board. You should apply for this college, if you are interested in law courses.

Hi,
Yes, you are eligible to fill up any government job's application form, even from NIOS board also. You are eligible for all the government exams like Indian railways, banking sectors, SSC CGL, UPSC, etc.

Although NITs will be difficult with this score, but you will definitely get good architecture colleges like LPU, Sir J J College of Architecture, D Y Patil, SRM and TCE Madurai with this score. Therefore, you should apply for these colleges at the time of counselling.