If one of your courses has this as a marking scheme....you might be a math major

Marking scheme. The final grade will be made up as follows. The two term tests are of equal weight. The contribution to the final grade from the term mark will be denoted T and that from final exam, F; both are taken out of 100 for the computation below. The term mark, T, will be composed of marks on the problem sets (more or less weekly; best n out of n + 1) contributing 10%, and two term tests contributing 45% each. The final number grade, M, is obtained from the formula
M = .6F + .4T if F ≤ 60 or F^2/100 + T(1-F/100) else;
subject to the constraint that a passing mark on the final exam is necessary to pass this course. The letter grades will be determined (modulo the constraint) from M via the standard translation, except that D will be given by 49–54, E by 45–48.99, and F, less than 45.