Hi Shanu,
It is good to hear that you want to become a teacher in an era when everyone wants to be either a doctor or engineer.
So if you have decided to become a JEE faculty, then pick up your favorite among physics, chemistry or mathematics. Make sure that you should have a in depth knowledge about the particular subject. No matter whatever question is being asked, you should be able to answer that.
You can always take admission in Delhi University in B.SC or M.SC courses or you can do the same courses from well known IITs or NITs.
Then apply for JEE faculty in any good coaching Institute or you can start your own institute.
Best of luck.

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