Give each task a slot
Choose fixed blocks for planning, grading, copying and parent emails. Doing all copies once a week is faster than five small trips to the copier.
Plan a week ahead
Planning next week by Thursday leaves Friday for copies and setup, and protects the weekend.
Protect one evening
Pick at least one weeknight with no school work. Constraints make the other blocks more focused.
Do this today
Fill in the weekly block plan with fixed times for planning, grading, copies and email.