The Pomodoro technique encourages students to set goals, to avoid procrastinating, and to focus on one task at a time by alternating between work and breaks, which energize the student to keep going and gives the student something to look forward to.
While the length of time and the number of breaks can vary, commonly the Pomodoro technique asks the student to set a timer for 25 minutes and work on their task—and only their task--for that time. When the time ends, they take a five-minute break to do whatever they want. Once the break is over, they set the timer again for another 25 minutes and get back to work before they can take another short break.
Only working for limited periods of time helps the tasks seem less daunting for the student and helps build their sense of delayed gratification for their reward (which in this case is their break time).