If you find it hard to focus on the task at hand, you should try the Pomodoro Technique. Here is how it works:

• You set a timer for 25 minutes, get rid of all distractions and commit to stick to the task at hand for this block of time.
• After the 25 minutes, take a 5 minute break. Walk away from your desk, get something to drink, move a little.
• Repeat this process 3 or 4 times. After the third or fourth block, take a 20 minute break.

Why does this work?

• The 25-minute blocks are long enough to get meaningful work done, but short enough to not feel overwhelmed by 2 hours of studying ahead.
• A visual timer helps to focus and will help you to think “just 10 more minutes to go so I better focus and keep going”.
• The short breaks, combined with physical movement will recharge you for the next block of time.

There are lots of apps to help you try this out. I personally love Pomodrone, but just pick something that can help you or use the stopwatch functionality on your phone.