if you think you are AS, read around for the different possible symptoms.
if for most of them, you get an instinctive "that's it, that's me" feeling, (dont think, just feel), then there is a high chance you indeed are AS.
however, it is always recommended to see a liscenced psycologist to get an official diagnosis, not only will you know for sure then, but the diagnosis also enables a lot of assistance to you (different per country/state though).
you might get a partial disability income, get ADA-protection for example.
also, presenting a diagnosis can allow you to make your tests/exams at school/college in more time and in a solitary location, or possibly even in a different form (like, an oral exam for maths, if that works better for you)