Need some input

Hey I am a junior in high school and I am stressing out currently. Just got my grades back and it turns out I am failing alegebra 2. If I don’t pass it I don’t get the credit. I can pass I just need to work really hard but I think I can. I want to get some input if could get accepted into Ou with my grades. I also have a brother who is enrolled there and I was wondering if that helps.
GPA:2.7
SAT:1260
ACT:Not Taken yet

Have you tried calling admissions and asking them what they’d recommend to improve your chances?

Is that SAT score out of 1600 or 2400?