Focus is easier to protect when the task is specific. Before a session, write one question you want to answer and move unrelated tabs and notifications out of reach.
Use an honest session length
Choose a block you can finish consistently. A short session with deliberate practice is worth more than a long window spent switching tasks.
Reset without drama
When attention drifts, note the distraction and return to the next small step. Study methods should support you, not turn every interruption into a failure.