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To be fair to Arya Central or any other school: From my observation of Trivandrum schools, competition among students is tough and it's upto the student to make his/her mark; classrooms tend to be crowded and the emphasis is on academics - Arya Central is no exception.
See link below for CBSE Plus 2 exam results for Trivandrum city in May 2012. All the schools are comparable academically.