score estimate?

hi, so i’m self studying for my first ap exam (biology) and after taking some practice exams + checking my scores, one calculator gave me a high 4 and the other a 3. my section 1 raw score is 48, and my section 2 is …18. low by CC standards i know… in my defense i have little experience with this. cliffs notes calculated this to 57 points, which gave me the high 4 in that book. but idk that doesn’t seem right to me. opinions? thanks in advance, sorry for the rambly post