I'm pretty smart so it is really killing me that I'm making c's on my work in algebra.. I rush…

I'm pretty smart so it is really killing me that I'm making c's on my work in algebra.. I rush through and the mistakes I make are simple things like not copying the answer exactly how I got it on my scratch paper. Ughhh this is why I hate doing online shit bc it throws me off. Why can't it just be old school, listening to lectures, taking notes, and taking written exams!