[XltSystem]

I would say a good sleeping schedule is necessary for focus and a good diet also helps too. As others previously have suggested, turning off electronics is a good idea if you want to focus at home and also take regular breaks. Try to make a plan of what you are going to do too, this can help you stay on track and avoid distraction. Another factor that could affect concentration is the amount of exercise you do, physical well-being can affect your concentration ( there was a study on this i think, I'm not 100% sure though) and when i mean exercise i don't mean it like 5 hours a day and 7 days a week in the gym, just 10-20 minutes of daily exercise will suffice. You can get your doctor to prescribe Methylphenidate/Ritalin to help with concentration if nothing is really working, it stimulates the central nervous system and is used for many things involving attention/concentration.
I wish you the best of luck.