Curve grading is just conceptually silly. If a test does indeed cover the material, then answering correctly half of it should lead to a 50%, no more, no less.
If curve grading is required because the test doesn't properly assess what the students have been working on, that means the test was bad in the first place.
If curve grading is required because the test doesn't properly assess what the students have been working on, that means the test was bad in the first place.