Some great work is being undertaken by Learning Point in providing data about top performing schools in India. Links to a few pages on the excellent website are below.
National Public School, Bengaluru
Seth M.R Jaipuria School, Lucknow
City Montessori Inter College, Gomti Nagar, Lucknow
Pranasutra 
Thanks for adding this. These are all entangled in the RTE mess. Let’s see how long they manage to survive.
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