A Pomodoro study timer
Before starting, define the smallest useful study outcome: one section, one problem set, or one revision batch. A timer gives the session a visible boundary so you can focus on the work rather than watching the clock.
Study one clear objective
Use a clear duration, choose one outcome, and start immediately. Keep distractions out of reach until the session ends.
Use breaks deliberately
A repeatable rhythm is more useful than chasing a perfect schedule. Adjust the length to the task and protect your breaks.