CBSE 12th

They will ask you why did you drop your education and some questions during interview, be ready with that and pass the interview.

No you can not get admission. JEE-mains is compulsory to get admission.

You should have an outstanding percentage of around 98-99% than you may get admission in NSIT.you can get branches like (if you percentage is near the above mentioned percentage) me,mpae ice. Best of luck

Since your board percentage is outstanding i think you will easily get a rank around 10k which will make you elegible for ece and if your luck is on a greener side you may well get it.best of luck ,wait for the rank declaration

Hi
Boards require you to be thorough with NCERT and cbse syllabus so write and practice as much as possible. For JEE, you do need coaching to learn short tricks and tips and practice higher level questions, so first master the basics of all subjects and then take regular mock tests. Manage your time for both wisely.

Use the links mentioned below:-
https://www.resonance.ac.in/jee-main-answer-key-solutions/jee-main-2016-rank-predictor.php
https://www.shiksha.com/jee-mains-college-predictor

Hi
Choose your most fav subject and complete your hons in it. Once you hv done it, apply for fellowships like Gandhi, SBI, Teachfor India etc to understand the nuances of teaching and education. These are paid fellowships and train you well to be a teacher.

Hi
You need to score well in all esp. physics and maths and in IIT JEE to get CSE. It dsnt matter if u had CS in 12th or not though it gives the basics.

I hope you hv appeared for entrances like CLAT, LSAT, SET. If not, look for a suitable college here.
https://arts.shiksha.com/ba-llb-colleges-in-delhi-ncr-categorypage-9-33-1456-0-0-10223-1-2-0-none-1-0

if you qualify jee mains then u get iiit or some nit but m not sure about the branch,good luck hope this answer will help you