It would be interesting to know what data they use for these kinds of assessments outside the given ones for the course, that is the best 6 homeworks out of 8 a

It would be interesting to know what data they use for these kinds of assessments outside the given ones for the course, that is the best 6 homeworks out of 8 account for 30% of the grade, the midterm for 30% and the final exam for 40%.