(1) The following proportions have been applied for MA101 students who are class of 2007, with A+B+C+D as 100%.
A: 25% or more
A+B: 60% or more
C: 30% or so
D: less than 10%
In each of A, B, C, D, the ratio of +, 0, - is roughly 1:1:1.

(2) The students of MA103 and students of MA101 other than class of 2007 obtained the same letter grades (A+,...,D-) as those of MA101 of class 2007 based on the total score.

(3) If the total score is less than 100, an F is given. If the total score is less than 150 and the final exam had not been taken, an F is given.