Tidy up your workspace and clear it of distractions (to forcefully remove distractions on your phone, use forest app)

Use an interval system (pomodoro)

Trick yourself into doing the work (studying) for some reward (snacks, youtube, gaming, etc)

Listen to the right sounds / music (my go-to ambience folder has rainymood + fireplace crackling videos)

Gamification (habitica)

Figure out how you study; try different methods of studying and see what suits you the most and then stick with it

Understanding Concepts > Memorisation

Memorisation with Strategies > No-Strategy Memorisation (i.e. if you have to memorise, do not do so blindly; use mnemonics, analogies, stories, grouping, memory palaces, whatever that helps)