On: School cell phone bans and student achievement

[kelnos]

That also depends on how the tests work. If each test covers both the new material since the previous test, as well as older material, then that would require students retain all the material, not just the recent stuff.

Or maybe the last test of the semester covers the entire semester's material, while the earlier tests only cover new material since the previous test.

We can't say for sure without this information.