I don't remember the last time I had a test that covered 100% of the material in class. The very thought scares me, some classes such a test would take hours and a final would take half a day or longer.
How about a more convoluted method I had for my computation theory class. We were given 3 choices from a number of sections, each one of varying difficulty. Each choice was worth points from 10 to 30 based on the varying difficulty (and there was a major amount of difference between some, one 30 was to
write the proof that a Halting machine was Turning incomputable.
He then graded based on your total points divided by the largest number of points earned. He then converted this grade to the standard A,B,C... scale, but gave a +/- on each letter except D and F. He then converted this to the following scale.
250 A+
225 A
200 A
175 B+
150 B
125 B-
100 C+
075 C
050 C-
025 D
000 F
You got four such grades (two test, final, and one composing assignments and a paper. These were totaled to a scale from 0 to 1000. Your final grade was then assigned by the following scale:
1000 A+
0900 A
0800 A-
0700 B+
0600 B
0500 B-
0400 C+
0300 C
0200 C-
0100 D
0000 F
So if you get an A on your first test, you are guaranteed a C in the class. Except your highest grade can be no higher than the percent of classes you attended or had an excused absent for.