I do not know about sentia school, but i can vouch for Unicent Schools. They had a branch in vanasthalipuram and my child studied in that, after they shifted to nagole and i could not shift my child because of a inconvenient location.
But i am aware of their management, their philosophy. They are very good. We used to have workshops for parents on how to deal with children. They have child psychologists on their board and they design the course and methodology of teaching. You can visit the school and talk to the present parents and take decision.