hello

it depends at what level you want to teach- at government schools, in private schools or at entrance exams coaching.

To become high school level teacher, you should be at least graduate with a B.Eddegree and you should have cleared CTET or STET to be able to teach till grade 8.9 and above grade don't require you to clear these papers but B.Ed and graduation. 

some of the private schools do not demand a B.Ed degree and you can be there if you have msc/bsc.

for entrance exams coaching you must have done your graduation from a prestigous institute and pass their entance test.

hope it helps.