Zo <3 keep your phone away, and id suggest installing the forest app on your devices to lock you out of socials on your devices.
also remember that study for each subject is and looks different, and it's solely up to you to decide what works. content memorisation subjects id suggest flashcards + applying it to questions. more application subjects id suggest focusing on questions with scenarios.
as time goes on you will learn what works best (unsure of your year level). if you're in years 11 or 12, maybe talk to your teachers because they can get straight to the point with techniques 🙂