When you come home from school of course wash your hands AND face. I always take a shower when i come home.
After that grab something to drink and to eat. Take your time to eat a proper lunch/dinner. I usually eat something that is low in calories but will make me full. Also, i drink a lot of water apart from that.
When you finish your meal give yourself a little break, maybe an hour. Play some sport, watch TV, read a book, paint etc. There is so much you could to that doesn't involve just looking at your phone. Do whatever you like, what makes you happy and relaxed.
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When one hour passes do your homework and study. Don't leave it for later that day/ next day/weekend, you will regret that, believe me. It's easier to finish all of it on time than rushing when you realize that you don't have enough time to do everything well. If you don't have any tests coming up just go through your notes. It will help a lot when tests start coming.
Try to finish your homework before dinner so you can have free evening. You will feel relieved because you finished all of your school work, and you will have free time for yourself.
I hope this post helped you in some way!
Do you have after school routine? :)