Being organised does not come easy to many people, including adults.
Planning your day, your homework, the next few days, can reduce stress for you, and for others (such as your friends and parents).
Being able to organise your thinking to say "no, I have to get this or that done first", can be tricky, especially if the alternative is very tempting (like having fun with your friends).
Click on the retracking organisation
for some more ideas and information.