That's nonsense. Your IQ is largely fixed late in adolescence, it's a measure of cognitive potential, nothing more and certainly not education.
Back when I was at school they made us all do an IQ test, this was in the 80s when we were 15 or 16 years old depending on when in the academic year you were born.
After about this age your IQ will generally not change much if at all. You might be able to spend your time practicing IQ test type questions and get better at the tests but that doesn't change anything other than your ability to do those type of quizzes.
I remember we were told during the test that there are many more questions that we can possibly answer in the alloted time - likely about an hour and that's how it's designed - they said don't allow yourself to get stuck on one question - if you don't know it and can't figure it out just leave it blank and move on to the next question.