How many packages you bought, how many sessions are left, which one expires first, all on one sheet

Name: Lesson Passbook
Brand: Course Kit
Availability: InStock

Want to know what is still left on your courses? Fill in the amount and the number of sessions, and the sessions remaining, the days to expiry and both price-per-session columns work themselves out.

The course overview sheet, with columns for total amount, sessions, used, remaining, nominal and actual price per session, days to expiry and status

You knew exactly what you had the day you paid. Three months on it is "I think there are a few left", and the clock is still running.

Fill in the total amount and the number of sessions, and remaining sessions, days to expiry and status calculate themselves
Nominal and actual price per session sit side by side: 12 sessions with 5 used shows 500 against 1,200
Log a session with the course name and the date, and the overview updates itself, so there are no two sheets to reconcile
The countdown shows up early, instead of finding out at booking time that only a few days are left