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Keeping track of your allowance or money earned from a part-time job

Keeping track of and forecasting your grades so you can project your final GPA/grades

Keeping track of group projects and your group members' contributions

Keeping track of phone time and number of texts to make sure you don't go over your monthly limits

If you participate in sports, it can be things like miles run, hours practicing, progression in things like times, distance, weight, etc.

Medical office management

keep history of you utility bills so you can watch for abnomally high or low bills.

Figure out amopunt of interst paid on two possible loand for a car so you know which one costs more in terms of total interst paid. (5yr vs 7 yr loan).