I had a lot of trouble handling this, I still do and probs will do so in uni...
I try my best to visualise my goals and believing in them. I tell myself, "You can do it!! Do an hour of 4u and reward yourself a cookie" and sometimes I can manage that. I stick a poster up my wall that reads UNSW and ATAR>90 as motivation. Everytime I see the poster, I imagine myself walking down UNSW's fab paths and beautiful architecture.. and that keeps me going. Now, I've done it
Get rid of all your distractions, holy crap.. this was the hardest thing! Don't study on your table next to your computer.. I ended up on my pc watching anime, Youtubing or Fbing the whole night till 3am.. then I'm like.. "Fuck! Gotta wake up nek morning at 7am for damn morning 4u sesh and haven't even done my HW" <== worst case scenario lol. Sometimes, I go to the library after school to revise my notes or do maths as I feel more motivated in the environment where pretty much everyone's studying. Then I feel good when I walk home and listen to my music knowing that I studied a solid 2 hours or something.
When studying at home, try to turn your phone off, and study in a different room, look at your personal motivational poster, set yourself a mini reward for each hour of study. Also try study in different environments, I read my Economics notes in the park, on my bed, on the bus, while walking around the house reading aloud pissing off my parents (but effective
) and also during assembly (that was a totes waste of time, I was so bored a few times, I actually sneaked and read over an essay during all the bull)
Learn how to control your usage of the internet.. I still have to learn that. Don't let it take over everything
Listening to music sometimes helps especially for maths (soft acoustic helped me for 4u)
Sometimes, the hardest part is the start, so when you start to do a question for a few minutes, it becomes easier and you're more willing to continue until you feel a bit tired then get a good break and feel proud.
Be sure not to work too much on the other hand. Gotta have a balanced lifestyle. So, I study, procrastinate a bit - control dat damn fb youtube etc., play bball, hang with friends occasionally, eat healthy, good quality sleep, play piano, have a walk in the park, etc.