Answer:
Get organized and create a plan of what you have to complete. Remove any distractions that may stop you from doing what you have to do like your phone. Listen to calming music or binaural beats while doing your work to keep you focused. studies show our brains can only maintain focus for about 45 minutes at a time, so don't force yourself. Take it five minutes at a time and if you feel ready increase it to ten then 15 and so on.
Hope this helps