imagine yes, read the matter silently. switch to loud reading after some time. this is what really seems to affect your mind coming back to your studies. imagine the condition and scene about the topic which is being talked about.
i have seen people closing their rooms and studying hours and hours and hours without stopping. i still wonder how and why they do it. and then they complain “i studied so much that my head pains since ages.” you don’t need to drown into your books and die, instead swim in it gracefully.
the mind does better when you take a short break every half hour to an hour. this helps 