Prepping for college

Hello! and happy (almost) Thanksgiving. I am a Junior in High School and I only recently started truly thinking about college. I aspire to the photography/film field and I dont have the best GPA. (weighted 2.0)

I recently dropped my APUSH class and I’m hoping that will be enough. I do pretty good as a remote learner and I’m shooting for a B average. I’m confident that I can bring up my GPA but there is also so much I don’t know about college.

Does anyone have input on how I can start prepping? What tests do I take? Is there deadlines? When should I start building a resume?