In the modern world we are surrounded by mobile phones, social media, internet and our friends wanting us to go out and do more interesting things than revising.
The only way to avoid this is to simply remove these distractions. Unplug your computer and turn off the smartphone. Otherwise you might find yourself quickly checking Facebook and before you know it, hours have passed by.
Mixing work and play does not work. You need to separate the two and build up your work session from 10 to 20 minutes or more without distractions.
Take ten minute breaks if you must Tweet or look on Facebook, but keep it to 10 minutes or less. The best breaks would be to go out of your work environment, away from computers and notepads.
Your Revision Tips
Write notes (ones you're able to understand, in your own words. Don't just copy) in colour or use drawings to help remember things. Particularly key words or explanations stay in your head with colour. And try to make it fun! Treat yourself to chocolate after a good, focused revision session. If that doesn't appeal to you, watch Youtube videos, there are so many formats - songs, funny sketches, experiments; all to help you learn!