Remove those stuffs which distract you before you start studying. It could be phone,laptop or anything which distracts you from focusing on your studies. I usually get distracted by my phone, so I try to keep it away from me. I prefer studying in books. If your study materials are only available in your laptop or phone, Don't forget to turn on the airplane mode to avoid any calls or messages.
"Don't decrease the goal, increase the effort"
-unknown