I would like to echo what the other have said, especially analogdesign, but I'm going to talk about IQ. If the OP is anything like me, and I think he/she is since I had the same thoughts at that age, then he/she will also think that they know better and are smarter than most other people. and that their thoughts are probably more accurate, though the experience of others is helpful. I know I thought that IQ was imperfect but still extremely accurate, party out of arrogance (I pretty much thought I was the smartest person on Earth lol), but I now know that a simple test designed by the conscious human mind cannot, and can never, accurately judge the conscious and subconscious mind of others, it is simply to difficult with too many sources of error. If we can ever really accurately determine how smart someone is, then it will be by the analysis and scanning of someone's brain activity over a period of years.
I would like to stress that I am in no way implying that the OP is anywhere near as arrogant as I was, or that he/she even had any of these thoughts in the first place. But the possibility that they are like me exists, and I want to say this in case that possibility is true. Please do not take any offense from this, anyone.