My son goes to Tatva. I am really happy with the school. The teachers are well trained and their command over language is good - the teachers speak to the kids in their own mother tongue to make them feel at home. The teachers are very friendly and nice with the kids. Tatva has already completed a Water day activity at school and they have done an outdoor activity to Guindy children's park and the third activity is scheduled this month.
They have a well thought out curriculum split into themes. Since we are getting closer to independence day the theme is about india freedom and about national leaders. They involve the parents also. We have a parents workshop on 2nd and 4th saturday and they let us know what they will be covering in the next 2 weeks, stories, rhymes, they also give us home activities to do with the kids. They include parents in the learning session - the school encourages us to enforce the concepts or activities that are taught at school.
This school started recently and this is their first year. But what I really liked is they were ready to receive the kids on day 1 and on day 2 parents were asked to go home and they managed all of them on their own.
You can ping me if you need more info.