Dear friend, unfortunately as a B.E degree-holder, you can't work in a school as a teacher. The reasons are indicated below:-
(a) To teach in a school, you have to obtain a B.Ed degree.
(b) For taking admission in B.Ed, you must study a 'teaching subject' upto Graduation level.
(c) As a student of B.E, it can be safely assumed that you have not studied any 'teaching subject' upto Graduation level.
If you are genuinely interested in teaching, I would suggest you to join a reputed coaching institute in your city as a teacher and prepare student for variousEngineering Entrance Examinations. I can assure you that it has become a very lucrative profession in India. I have seen many teachers are earning more than a crore (annually) preparing students for various Entrance Examinations.
You can give it a serious try.
Beware! I question everything and everybody.