IQ tests are kind of bullshit. They test how good you are at taking IQ tests, not any concrete skills.

Source: had to take multiple IQ tests as part of my IEP in school. I scored 160, 80, 115, and 130 in that order. Why? Because my first tester didn't tell me I was taking a test, my second tester pulled me out of lunch and recess to take the test, my third tester had to throw out a portion of my test because I apparently didn't follow the instructions (it was one of the matching sections and I matched all in set a then all in set b and apparently that was cheating, but the instructions didn't say not to so whatever) and the third time I knew if I scored too low then when I went to high school I would be placed in special ed for a period out of the day and I was very stressed about that happening.

Your IQ score is not supposed to change much from year to year, let alone in a difference of 80 points.

I also managed to get straight Ds through middle school, B's A's and C's in high school, and straight A's in the two years of college I attended before I started having a nervous breakdown and stopped being able to physically be on campus without having a panic attack. Fun times. Now I'm waiting to be accepted into an online college so I can finish the other two years for a bachelor's degree I already know I won't be able to use due to my apparently crippling anxiety, but my parents will disown me if I don't get it.

IQ is not a barometer for success lol.