CBSE 12th

Unless you have a GLM quota, it's almost impossible.

You can apply for jobs like Stenographer, executive- language, etc. in which candidates who are a graduate in particular language are given importance. Every PSU and government sector industry has the post available for the language.

Hello Rohit,
Congratulations! First of all, you did a great job back then and yes you can think and prepare for CAT from 1st too so that you can perform well at the end of your degree and get yourself into a reputed IIM.
Good luck.
Thank you.

Hello,
If you are satisfactorily fulfilling the age limit criteria which is : The upper age limit to be eligible for JEE Main is 25. Age limit is relaxed by five years for SC, ST, PwD candidates, Then you can continue your studies. Also you have to appear in entrance exams like JEE-Mains, State CETs, etc.
Good luck.
Thank you.

Totally your choice all your subjects till 12th other than accounts actually have no relation and also if you aren't from accounts background it's alright.