You should not feel that your time in school is simply being wasted by having to study a mundane education. You can take advantage of the situation to preach to your classmates and give them books also. Try to take shelter of the story of Prahlada Maharaja, and how he would take every opportunity to preach Krishna consciousness to his classmates, who were all born of very demoniac families! Your associates in school will naturally ask you questions about the beads around your neck, and why you do not eat meat. Take advantage of their questions to tell them about Krishna. Some students will probably be disinterested, and some will probably think that you are strange. However, this will help you to become even stronger in your convictions, because you will get strength from preaching to them.
(Collected Letters to My Disciples, Pg 152, 2nd Paragraph)