Sabari,
Check the link:
Good Schools in Chrompet - IndusLadies. In this there is a post by MeenaViswanathan whose kid is studying there. You can try to post your queries to her as she will be in a better position to answer.
I got the following information from one more thread:
Sundaravalli school has a montessori system, but would have around 30 kids in a class(which i think is too many for what we pay(10,000 caution deposit +30000 total fees). But have heard a lot about that school
Also check
Schools in chennai link where many schools have been discussed.