This makes no sense is there a story you forgot to put or? what
Because they're other people who might need it, it's like how you shouldn't waste your food.
Answer:
Math
Explanation: I’ve always had a problem with math. But I know that if I keep practicing then I’ll get good enough to be good at it in collage
Answer:
that
Explanation:
"that" is better than "which" in this situation