I'm completely toasted

Rising senior here-- I felt I had a very promising chance of getting into good schools (I want to do political science and international relations) with a 3.81 UW GPA, and a 4.62 Weighted, but my hopes of that feel nuked. I went from having an 84 in my Physics class to a 77 from a very highly weighted test (never had we had something so highly weighted), and now it looks like my semester grade will be a C (last quarter was really bad, also got a C) I studied for said test hard, and I just feel so defeated. I even thought the rest of my transcript is stellar, and I'm going to get great Recommendations, I just think my chances are torpedoed. I don't know if I'm overreacting, but it sucks man ☹️ now that this is happening, since I'm taking 6 APs for my final year (for a total of 12) I feel like I've lost confidence in myself, which feels stupid.

Thanks for listening, sorry if this reads a bit complainy. I get it if it does.