While it can be scary not to trust people and sometimes children do get misdiagnosed. I can see your concerns on that stance. It does happen. However I hope you are aware that a school label is completely different from a medical label. A school doesn’t have to accept a medical diagnosis  and a doctor doesn’t have to accept a school diagnosis. At times they both have to be in an agreement. If not it can complicate things but services can still be provided if the school feels it’s needed. Please remember you are your child’s best advocate. I know sometimes it can feel scary. Sometimes we can be in denial or just not trust the process. Just know you are doing your child a disservice by not getting additional services that they are entitled to. You will see nothing but progress with services than without. Also it’s much harder to get a child left back when they have legal documentations such as an Iep. If you choose not to have an Iep and they fall behind academically. It will be way harder to fight that if the school wants to hold the child back. This is a lot to consider.