IQ tests are adjusted so that the average score for a person in that group is 100. That means that half score over 100, half score under 100. 129 means you scored well above most of the people in your group.

But the online test is not very accurate. It can give you an indication of what your score is, but it may vary by 20 points either way. For a really good, accurate IQ score, you need to take a test given by a trained tester in a controlled situation. That would most likely be given by a psychologist or counselor.

Supposedly, a 100 is average. I strongly suspect, however, that for most tests the scores are skewed a bit higher, because I almost never see scores below 100.

With a score of 129, you’re pretty bright. Higher than average. Probably not a genius, though.

Good luck with your education!

Actually, if you are a teen, age doesn’t really matter for IQ. So, I would say you are really good.