Often, getting started is the most difficult part of any learning plan. Students are not born with time management skills or a tool box of ideas to help them move away from procrastination and into "pro-activation." That is why I made the graphic above. It describes a simple plan to help increase focus and decrease procrastination.
Additional tip - start with your most difficult work first.
For teachers, this cycle of focused work and breaks could also help you plan the flow of activities in your class to better address student focus.