Leave the ADHD out of the conversation. Just get the cognitive testing done by a reputable doctor who is NOT associated with your family in any way. Brainstorm and research other reasons such as you want to know your IQ (it is not part of the test but maybe your parents don’t know that). Let the go for a short time, give it a cool off period then ask for the testing. Sure you are skewing the truth but it is for your own mental being. I hope this helps in some way.
REPORT ABUSE