You'll feel better on Swiss.
Take a break then go in for some dedicated study sessions (50 mins with 10 minute break)
Don't watch tv or go onto facebook/boredofstudies for your 10 minute breaks.
Don't sleep late! Wake up early, your performance and effeciency will increase incredibly! Try it one day and you'll see the difference.
Eat healthy, no late night food binges because you're 'staying awake to study'.
Play some sport or go for a jog. It increases your memory retention.
Make a list of things to do for the day (make them reasonable and don't use making the list as a means of procrastinating). Cross them off as you finish them and before you sleep you will have the satisfaction that you've done all the necessary work for the day. If parents are bugging you then show them the list and say this is what you'll be doing today (if they too can see something tangible - work written down on a piece of paper, they'll be happy as well).
Stay cool.