CBSE 12th

Hi
For B.Ed you need a under grad degree like BA/ B Sc. If you are keen to go for teacher training after 12th, you may opt for NTT or D.Ed in your respective state through some govt institute.

After 12th take admissions in b.com (hons) accountancy and finance would be the best choice of honours , if you have plans of doing MBA after B.com then start preparing for exams like CAT,MAT,XAT,SNAP,GMAT,Etc. after you complete 2nd year in graduation degree,if you have no plans for mba then you can opt for CA or CS . Best wishes!
regards!

You can do Bcom, BBA,

You need not have to fill any form during 12th. After 12th, You have to opt any one of the field.

yes you are eligible

Board Marks will be considered this year. From next year it may not be considered.

First check your expected rank through Shiksha's rank predictor app https://www.shiksha.com/jee-main-rank-predictor
After that you can find a college best available using Shiksha's college predictor app . https://www.shiksha.com/jee-mains-college-predictor

Chances are that you'll clear JEE Main, since the cut off is expected to be low this year. Your rank may be below or around 2 Lakh, but that is only a tentative idea. It may be lesser also.