Most of the schools have French but getting an admission in schools for class ten is a challenge. To answer your question direct it's better if you specify the exact location. This will help you to more responses
Chennai, near Vijaya nagar / Velachery.
Did you find school near velachery?. we are same condition moving to chennai from Brussels looking for grade 6 for my daughter.
only very few schools give French as language. Mainly international school has French but with huge amount of fees.
I'm a French student too, studied in gill Adarsh, Royapettah chennai. Not necessarily only international schools provide French as second language you can find a decent school within your locality too. Good luck n God bless