The goal of school isn't just to pass the tests. If a kid fails to revise for a test, but it doesn't matter because their parent will just look up the schedule and force them to revise, then they learn nothing beyond what's in the test.
If they fail to revise and as a result do badly at the test, then next time they might actually take the initiative and revise through their own motivation, and that's a far more valuable skill than anything that might actually be in the test.
The goal of school isn't just to pass the tests. If a kid fails to revise for a test, but it doesn't matter because their parent will just look up the schedule and force them to revise, then they learn nothing beyond what's in the test.
If they fail to revise and as a result do badly at the test, then next time they might actually take the initiative and revise through their own motivation, and that's a far more valuable skill than anything that might actually be in the test.