Hi Deepak,
There is no criteria like you should get this much percentage to be eligible for teaching. A student who got 40% in boards may teach better than those who got even more than 95%.
See, if you have the passion of teaching than do it, nothing can stop you from that. If you are wanted to be on the safer side like you can pursue B.Ed or any other related course then 75% would be more than sufficient.
Feel free to ask doubts in the Comment Section.
I hope this information helps you.
Good Luck!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile