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I just started working at a high school this year and one of my largest obstacles is seeing all my students! There are constant schedule changes from field trips, testing plays etc.
I use an excel spread sheet every week to keep track of each of my students and who I have seen and who I still need to see. This let's me constantly move students around to accommodate their busy schedules. And I have it laid out one week at a time. This has also been beneficial when I need to go back and look at attendance to sessions across several weeks.