Ap macro and micro

Hey guys so like most of you I’m studying for both exams since probably two weeks ago. Today I decided to take a test in ap microeconomics, practice mc and fr out of the book made by rea. My weighted score all calculated out was a 72.5 which according to its scoring distribution is a 5. It says that in order to get a 5 you must have a weighted score of 70-90…composite of course. I wanted to know how accurate is this range? Does it change from year to year? Anyone know what percentage i should be hitting on MC to get 5 for both exams? Free Response? Thanks for reading and any input would be awesome!</p>