What should I do in my 10-minute study breaks?

Do anything that makes you feel fresh except using :-

Mobile

Any kind of social media (like Instagram , WhatsApp and even Telegram)

My suggestion is that you can :-

Listen to music

Go for a walk

or you can just sit with yourself

Pro Tip- if you feel like talking to someone then talk to people who make you feel good and discuss things that does not bother you. Talking to toxic people will waste your time and disturb your peace of mind.

I used to drink cold coffee during my study breaks.