I can't control my Autistic meltdowns. Any tips?

ask if you can take your exams either before school or after so that the room is quiet and no one is there to bother you. As for the meltdowns if someone is pestering you say I cant deal with this and for my own health to go calm down then walk away. My nefew has autism and we have found if he has a certain things he can hold or rub he will be calmer. Try finding something that helps you center your mind and calm down be it a stone or a key ring or what ever you choose