1- PRACTICE PRACTICE PRACTICE
Practice makes perfect! Practice focusing on a specific object for a specified period of time. For example, focus your eyes and thoughts on the flame of a candle for 3 minutes while trying to keep your concentration towards it throughout the exercise. You can also do the same principle during your working hours directly by fixing the tip of a pen, for example.
2- FOCUS ON YOUR BREATHING
When you feel that your concentration is derailed and you have difficulty turning your attention back to your work, take a few minutes to take a few breaths by inhaling deeply through your nose and exhaling quietly through your mouth. The incoming air should cause the lungs and diaphragm to expand and not the shoulders to raise or the upper rib cage to get tensed. Your thoughts should be turned to the rhythm of your breathing and nothing else.