AP Score possible mistake?

Not sure if this is the right thread but it’s related to AP tests so I thought I’d give it a shot. I took the AP US History exam in my junior year and received my score a few months late due to some error they never let me know about. I got a 1 which was surprising cause I had studied and felt I had done pretty well. I’m not entirely certain if there was a bad mistake I made that resulted me in getting that score but I don’t know what to do otherwise.