Just a technical note: "spectrum" in autism spectrum disorder doesn't refer to a scale from "mild" to "strong", but refers to a spectrum of symptoms/behaviors.

There is a broad spectrum of symptoms which fall under the autism spectrum. Everyone who has ASD, has a number of these symptoms but two people who both have ASD can easily have none of these symptoms in common.

Which is another indication you are not very knowledgeable on the subject. ADD/ADHD are disorders on their own. It is a common comorbidity for people on the spectrum, but it's certainly not part of the spectrum.