My g.son (nearly 21 yrs), was diagnosed as Autistic when he was in primary school. Despite a good SENCO at his secondary school it did not work almost from the start - and he was soon being suspended over and over again. Indeed, the Senior Senco officer at the education department labelled him at 'Uneducable'. My daughter and son in law fought a long, hard battle to get him into a special school for autistic children - finally won and he went for three and half years as a weekly boarder.
After he left with a good clutch of GCSE's and, even more important, a whole number of Management techniques, he went on to A levels at the local FE College. Their Senco department decided it was best to take it slow, so the first year he just did one A level, picking up a second one during the second year and so on. At the end of the four years he left there with 3x A and 1 x B (his first one), in Further Maths, Chemistry, Physics and Maths.
Now happily settled in (even in these Covid times) doing a 4-year Masters Course at Uni in Chemical Studies. Still receiving some support there, but has actually made friends amongst his hall fellow students, and has actually become their spokesmen in regard to some problems with those Halls.
Obviously, all autistic children are different, as are all children, but if they are helped to understand their condition and how to manage it - they can lead perfectly normal lives.