autism diagnosis

hi all my name is jade, and my son who is now 3 has been diagnosed with an asd but no-one will tell me where on the spectrum he falls, i know its like an umbrella system or so its been explained to me but the school i want him to go to will only accept moderate or severe cases of asd children so how do i find this out? i have his scores from his ados assessment can i find out the severity of his case from this? any help would be greatly appreciated xx