Managebac Grade Calculator & More+

The "grey out completed tasks" does not work for the full calendar view

Hello, I need help. I really want to see more or less which grade I will get for each class but I am kind of confused to where I should look. When I go to the classes, on top of the bar graph it only shows a color and says set.

it says grade NaN% what does that means? how do i use it

I have to use managebac because of my school. The teachers don't show your average grade until the end of the trimester, which can make it really stresfull and hard to know if you are passing or are exempt from final exams.