My school want to have me tested for Autism or Asperger syndrome but my parents refuse?

Tell them that it will be more comforting to you knowing if you really do have a condition. Them ignoring the factors is unhealthy and this topic will just keep coming up ending you guys with stressful arguments. I say tell em to just let you take the test and reassure them that you'll be fine with it and if it makes them feel any better convince the people to make it confidential.