Assign each task to a category according to its priority. Putting off unpleasant, routine, or difficult chores is human nature. You have to discipline yourself to tackle the things you dislike or fear first to make better use of your time. For example, you can make a mental list of the things that need to be done while showering. Be creative, and let it work for you.
Outside distractions can be a big time-waster.
You should try and either physically block out disturbances as much as possible or mentally tune out as many signals as you can. Once you've determined your pattern of physical and mental energy levels, try to adjust your daily schedule to mesh with it. By handling mentally demanding jobs during your peak energy periods, you can get more done in less time. You can gain precious hours by passing along mundane, peripheral, or partly finished work to subordinates or co-workers. Politely saying no should become a habit.