Would an IQ test give me the most accurate indication of my intelligence?

I am questioning my intelligence at the moment as I have made mistakes both recently and in the past, which would indicate that I am stupid. I do well academically but that doesn't mean I'm not stupid, that could just mean that I've studied harder than other people and it does seem likely. Will an IQ test measure my raw intelligence, or lack of? I have done the online IQ tests before and my scores ranged from 95 to 110. Mainly they were 100 or a few marks below. Thanks!