The telephone is the ultimate interrupter. People calling can not tell that you are studying and that they are distracting you. Avoid this problem by studying in the library, unplugging the phone, or getting an answering machine. Learn to say no. This is the ultimate time-saver.
Many people feel that it is rude to refuse a request.
However, it can be done effectively and courteously. Your priority is to succeed as a student. Using signs can relieve you from having to deal with interruptions. Get ready the night before. Completing a few simple tasks just before you go to bed can help you get in gear faster the next day.