Before I even open my books, here’s my quick ritual:
Clean desk – clutter = great starting point
Water bottle + coffee – hydration & focus team-up
Noise-cancelling headphones (or lofi beats)
Timer set: 50 minutes focus, 10 minutes break
To-do list written on a sticky note – realistic, not heroic
What’s your must-have before a starting a study session?
A cup of coffee or tea is a must for me if I have to do deal with an intense topic! Eg respiratory physiology 
Keeping the phone out of reach
Solid point! 
A cup of coffe and activated parasympathetic nervous system!
I always use timer in Forest app and it encourages me always to study.
I always drink water time to time to maintain my concentration.
Totally relate! For me, I need a quick 5–10 minute walk before sitting down—it helps clear my head.
Turn on the forest app, open windows for fresh air and keep a chocolate bar handy.
Clean table
Books, papers, pens, pencils,… keep nearby.
Coffee and water bottle are must for me.
Activated parasympathetic system 
My phone on silent is a must for me 
Meditation for 10 mins! To avoid the overthinking and increase concentration
first thing switch off your phone