You can complain at any age. It may help to involve an adult you can trust such as your parents/caregivers, a teacher or the school counsellor. Schools are run by Boards of Trustees who are responsible for making sure the school operates properly and it may be appropriate to complain to the Board about some matters. You can write to the Chairperson of the Board of Trustees and set out your complaint and/or ask to speak at a Board Meeting. If there are other students or parents/caregivers who also wish to complain (e.g. about a policy or practice of the school) they could go to the Board meeting to speak also.