See an advisor before getting started. As her about taking courses in the right order and at the right time. Follow the exact program outline from the beginning and don't get behind. Many colleges and universities offer courses on a rotating basis; getting out of the rotation could cost time and prevents finishing early.
Take advantage of summer semesters and "intersessions" to add additional coursework or electives. Schools offer these sessions to allow students to take a more difficult class alone, rather than with other courses making it easier for students to concentrate, thus getting better grades. Instructors often pack the same information into a shorter time frame making the class more efficient.
Find out if the school offers online classes in place of traditional classroom work. Online classes can help working professionals who may travel with their job or who have child care issues. The online forum gives flexibility, while allowing students to finish their degrees on time.
Inquire about accelerated programs with classes on nights and weekends. Schedule classes that may occupy every weekend, but allow you to complete the degree in less time.
Question the school about transfer credits from other schools, especially in cases where the school doesn't offer a particular course in the time frame needed. Most master's programs will only allow students to transfer in six to nine credits from outside schools.
Ask for help when needed. Failing a course can cost time and money. Get a tutor if the coursework becomes too difficult. Most instructors understand people getting a master's degree are working professionals and juggling time between a job, family and school.