Actually, an IQ score of 120 for a person of any age corresponds to the 91st percentile. This means that you have scored higher than approximately 91% of all people who have taken that IQ test. Since IQ can change during the teenage years, your IQ when you become an adult may be a little different than it is now. However, by the time you reach adulthood, your IQ will begin to stabilize. If you wish to increase your IQ during your teenage, read lots of interesting books, do a lot of puzzles, and study as much mathematics as you can. But also take time to enjoy yourself and participate in sports. We do not yet know precisely how much we can change our IQ, and it probably varies from person to person, but the science of epigenetics suggests that our intelligence is somewhat malleable during adolescence.
