you can improve your iq.
i sat a test (online) and one of the questions was based on pythogoras a2=b2+c2 ( which i hadn't done since high school, so i got it wrong)
anyway i got 131 in the test, but i later took a maths course as a refresher as i'm training to be a teacher, and relearned pythagoras. if i sat the test again surely i would improve my test score?