Best way to work efficiently

It depends on what type of work you do. If you do work on your PC, close programs you dont need (skype, discord etc), turn off your phone and maybe listen to relaxing music without lyrics.
What personally works for me is setting short deadlines. For example: Im coding a part of a design and whenever Ive finished it, Im going to smoke a cigarette, eat something or watch an short episode of a series I like. This is kinda a reward I give to myself and it works out pretty good.