While the formula to translate raw scores into the scaled 1-5 score varies from year to year, a good rule of thumb is to aim for at least 70 points out of 108 for a score of 5, and at least 60 points out of 108 for a score of 4 or higher.
BC比AB5分的比例高,不是因为BC考试简单而是去考BC的都是自认有两把刷子的
https://apstudents.collegeboard.org/about-ap-scores/score-distributions