The drawback to having tests count for most or all of the student's grade is something I see with my 2e kid, though. When dealing with an erratic tester or a kid who misses a lot of points for silly mistakes: transferring the wrong answer to the answer line, not showing work, making calculation errors, etc., I wish that my 2e kid's homework actually did count for some of her grade b/c she knows more than her test scores show at times.

Study Strategies for Accelerated Learners