The Grade Book does look at the max points for the assignments when a teacher selects to drop lowest grades. It will drop the grade with the lowest max points first. Meaning, if a Teacher selects to drop the two lowest grades and a Student has three 0s, for assignments that are worth 100, 50 and 25 points, respectively, the 0s for the 50 and 25 point assignments will be dropped. This is to keep important assignment grades from being dropped from the Grade Book.