could someone give tips how to concentrate in studies??

it can be hard, but i always need a visual cue, for instance if your studying to be a doctor put up a picture of one near your study space, so when you get distracted youll look up and see it and realize that all this work is going to lead you to become successful in life and have your dreams realized, also surround yourself with people whose goals are compatible with yours, if you have lots of friends who want to go out and party all the time you are going to have so many distractions, try to make friends who are willing to spend time discussing classes you are enrolled in, one friend of mine in university took most of the same classes as me, so close to exam time we would look back through our notes and make flash cards, if you dont have cards just fold printer paper into halfs twice and tear, write down the question on one side, the answer on the other and quiz each other, if you dont have friends who are in the same classes you can do this yourself look at your question and try to recall the answer, i found the process of writing it out helped solidify the answer as well, learn your personal learning style, visual (reread texts and notes and rewrite them), verbal ( read the questions aloud and then answer them outloud) i hope you are successful on your midterms, education can take you very far in this world