Dear Hema,
Just now I saw this thread. I am placed at Pallavaram on the hill side. Near our place is the Vel's Vidyashram which is closer to the radial road ( 100ft road) joining G.S.T.Road and the Old mahabalipuram Road. It should be about 15-20 minutes from Madipakkam.
This school runs on the PSBB model and they are the ones who started this. You would have heard of the Vel's college and all. It is the same and has till Plus2 from Nursery. If you like , you can try it out there
Latha