Does anyone know what will help me concentrate?

hi, okay so i am fifteen and i have the tendency to procrastinate, space out, and focus on other things a lot while i am trying to study or do homework. the problem is that it's the week before midterms and i am trying so hard to study. for the past two nights i have spent from five in the afternoon to 2:30 in the morning studying and now i am sitting at my computer trying to read and write notes on a word doent (because that's the new way i found i learn best) but i am still so distracted. since i have to get up so early every morning, i am currently working on three and a half hours of sleep and so far tonight two cups of coffee which is obviously bad. my friend changed my facebook pword for me and my mom took my phone soo i dont know why i cant concentate. any ideas on what to doo