Dear Hammad,
Good friends are the gift of Allah. If you want to find good friends, Allah will really help you out. In order to find good friends first consult with your teacher about this problem. May be he can help you because he knows you better and he can guide you which students can become your friends at school. Try to be regular at the Masjid nearby your residence. You can also find good people over there and good friends can be found there.