My 12 years old son is irrisponsible spoild brat/ help on IQ and tests for ADHD please.?

Question Details: my son is 12 years old. he is now living with me 50% of the time. He was never igned any chores around the house. does not do his bed/ i have to remind him to brush his teeth before bed..My x was always busy and his step parent never bothered with his school work. Now that he is with me after school, i am finding it so hard to start all over ...like i have to show him how to write neet, i have to check his homeowrk online/ he does not lke to write on his agenda/ he procrastinate/playing comes first. he gets about 2 detentions per months for talking and getting off task/ even though i tell him every monring to behave well in cl and pay attention. his grads are A in PE and A in chior, and the rest bounces between D F C . do you know of a way to check his IQ on line for his age? Could i also check if he is an ADHD on my own/online ? Please advise. i feel that he is disrespectful somtimes, and he really need to learn to be responisbile. and i need h