this one test in particular comes up a lot in forums. i've noticed that it tends to give very exaggerated results. if it doesn't give you a "very high" result for something, chances are you don't have it. and if it does give you a "very high" result, it's probably a sign of something, but it could very well be asperger's itself and nothing else. or maybe an anxiety disorder or something. or maybe just "a bad phase". or maybe you're a teenager (practically a temporary personality disorder in itself. one of the reasons why teenagers are specifically excluded in the criteria)
and your knowledge of personality disorders makes a lot of difference when you're reading and interpreting the questions. like, when they ask you "do you often feel that people are saying bad things about you behind your back" (extra point for "paranoid"), the question implies that you have no concrete basis for your feeling. or, "have you been called cold and distant" (extra point for "schizoid)". the literal answer says more about the people you're surrounded by than about yourself
schizoid and schizotypal are things i've been diagnosed with at one point or another. i'm positive that i don't have any other of those disorders. there's no real treatment for personality disorders anyway, other than talk therapy (if that). even when it's "official", it's more like an "oh, so i actually am quite out of the norm" kind of thing. which often means it's supposed to be a realization that people aren't supposed to put up with certain things about you unless they want to, and that you should either try to improve yourself or come to terms with it