my son is 10th class appearing and I wanted to get his further schooling from such a school where the student is prepared for IIT

Dear Mr Bhagat, There is no school who will prepare students for IIT. Students Board Examinations in 10 and 10+2 will decide the streams and path. Student self study and teacher guidance. Your guidance is also playing a major role. He will join some coaching centers. I will suggest first he will pa