@francois_leger Well, actually it helps me a lot during high school! For me, it is a great habit because it helps me know what I have to do in the morning even though I'm still sleepy.
Only started doing it last year. I think if you don't have trouble planning you can put off using a calendar for a long time. But once things start getting busy, then it might be important to have one.
hhahh, when I decide and arrange things by myself, and then actually execute according to the calendar, I was 24 years old. Although I was also implementing according to the calendar before, it was more biased towards what was set by others and I had to abide by it, such as School courses, appointments with other hobbies, and work arrangements.
DL3ARN