Now that you have your sheet set up, the important work begins. You need to update your sheet at least once a month and every time a student leaves your studio.
This doesn’t take long, but it does take commitment.
Take it from someone who has set up many systems like this: The hard part is maintenance. When it’s new and shiny (i.e. while you’re doing this course) it’s easy to get absorbed by these numbers. But their power will only continue if you update them regularly.
Now go forth and keep measuring!