Write down to-do itens to do in specific day or period of work.

Always carry around your to-do list in your wallet (clear your mind from to-do's).

Separate work space from home/personal space.

Limit checking email 2-3 times per day.

Work in a silent place with no or very few interruptions.

"Pomodoro technique" for completing a particular task.

Eat properly, stretch often, exercise, sleep.

Set approximate time you'll stop working.

Set mid/long term goals and have them visible in your workspace.