Forest
If you find yourself distracted every time you try to knuckle down and get some study done, Forest is the app for you. Not only will it provide incentive to stay focused, but it will also make you feel good about helping the environment. Basically, the app works by allowing you to plant a tree — digitally, at first — when you stay focused for a period of time. The more time you spend free from distraction, the more points you accumulate, which you can then use to plant more digital trees or an actual tree if you’re keen. Trust us; you’ll become addicted to those digital trees. (Available on iOS, Android and Windows.)