There is not enough time in the day to honor that request with every student that wants to. Wanting to do this is based on the false notion that cramming works. It does not. Also, teachers change test days sometimes at the last minute, which would result in a late cancellation. I strive to teach the students that the goals are mastery of the material. Unfortunately, it is not always the case that the class dynamics in high school have this as the primary goal. The focus is often primarily on the next quiz or test. A memorization mindset then kicks in. Memorization does not work at well as learning the material.
I teach the students to be prepared daily for what they have been taught.