It could mean a lot of things. Academic performance is correlated with IQ, but low performance could also mean you don't have the time due to other obligations, or it could mean you're really lazy/just not into school, which is totally fair, or you're depressed.. In elementary school I'd get 60 minutes of detention -every- -day- for not doing my homework, in high school my GPA was 2.2 or 2.5 or something, in college I had to take special remedial classes because I got so many Fs.. I've always been depressed, and I find labor, including/especially mental labor, to be really misery-inducing.