But everything you listed there depends exactly on them and them only. It's their problem if they choose to have a role model who knows nothing, or choose to not learn things in math besides school assignments.
Intelligence only plays an auxiliary role in studying and yes, it can help you IMMENSELY, but you don't outright REQUIRE it to be successful. You want to know why I know it? Well, 2 of the students in my high school who were right under me on every test don't know where our CONTINENT is on the map, heck, they don't even know what a world war is, yet they had PERFECT marks in both history and geography. Same goes for math and chemistry - if you asked them what 4x4x4 is, they'd react like your stereotypical bitch from anime "hah, you want me to like, answer that question like, who the cares like, bitch please". They memorised every single line word for word and got excellent marks for it without even understanding what the shit they said.
They're both currently in uni, studying to become DOCTORS, and if they succeed, it'll prove my point that even the dumbest, most retarded fucks can go through the whole school system without ever utilising their intelligence. I'd hate to be a patient of those two in the future, as I wouldn't trust them on guarding a rock, let alone fiddling with my insides.
The only thing you need to get through the entirety of the elementary, middle and high school is the will to study - nothing else. It's not an argument if you tell me that they struggle with time management and memorisation when it's solely THEIR fault for it - it's not something one person is inherently better at; you develop it yourself, not God, and therefore everyone who has no mental deficiency is on the SAME level in it.