Late AP Testing

Hi, I’m currently a high school student enrolled in AP Calculus AB. I was feeling very confident during testing sign-ups, and I signed up for the Calculus BC AP Test. The test is in two days, and I’m still very confident on my AB material (averaging 80%+ on Practice Tests), but am not fully confident on my BC matter. I am thinking about taking the late exam, does anyone know if the late exam is harder for AP Calculus BC? Also, how do I get into the late exam? Do I have to bring a doctor’s note to my school, or have my parents explain to them about a family emergency?

The late exams are supposed to be comparable in difficulty to the regular exams.

Information on requesting a late exam is here: https://professionals.collegeboard.com/testing/ap/coordinate/late