Using Stephen Covey's prioritisation grid enables you to organise tasks based on their urgency and importance. Instinct tells us to action the urgent tasks first however in theory we should shift our focus to the important ones first.
Tasks deem to be Urgent & Important must be completed straight away. Once they have been actioned the Important & Non Urgent tasks should be completed. The third set of tasks to complete would be the Not Important but urgent tasks. Finally the Not Important or Urgent should be reviewed. Ask yourself if they actually need to be completed at all or are they just a distraction.