IB Final Grades

Hi guys, I recently got into Brown and I’m seriously thinking of committing, but I’m a bit worried about my final IB exams.

My admission letter doesn’t mention any specific final conditional IB score I need to meet, so I’m confused about how this works. Does that mean I’m expected to match my predicted grade? I was predicted a 45, but realistically I don’t think I’ll get that in the final exams.

Would my offer be at risk if I ended up with something like a 39 or 40 instead? If any IB students at American universities, especially Brown or similar schools, could explain how this usually works, I’d really appreciate it soo much!!!