ⓘ How the numbers are calculated
Average is the weighted mean of the two scores:
avg = rm·midterm + rf·final, where rm / rf
are the midterm / final weights from the ratio.
The planner inverts that formula for each grade threshold:
needed = (threshold − rm·midterm) / rf.
Bands needing more than 10 are hidden (impossible); every band is floored at
the minimum passing final of 3.0 (điểm liệt rule) — score below it
and the course is an F regardless of the average.