There are two kinds of intelligence, book smarts, and life smarts. Book smarts are what those tests quiz you on, book smarts is perhaps the least important of intelligence (but still can be important, and can accompany life smarts in certain situations, like politics, learning from history, etc).... Life smarts is the intelligence that guides you to make better well rounded, rational decisions. Life smarts are more important than book smarts though.
Also, it's impossible to be read up on every single subject under the sun, even if you did nothing but read 24/7 through many different subjects, your still not going to know about everything....the problem with IQ test as I said before is that theyr based on book smarts, but if you haven't read or studied anything on the fields your being tested on, there's no way you can know. It has nothing to do with rather your AS, HFA, NT, or whatever.