Because time is the same for everyone, then, at least objectively we all have 24 hours a day, the real challenge is not to manage time, but to manage ourselves, our activities. Some events can control them and others will not depend only on us, obviously, but with these simple guidelines you can organize your time better:
Set yourself some goals that will show you the way to go: without them you will lose yourself and you will go around without any direction, which will degas you. These objectives must be measurable, achievable, realistic, specific and adjustable.
During a day, make a study about what you spend your time: record everything you do and the time you spend. In this way you will discover if you can optimize your time.
Use the agenda: the improvisation is not bad, but to organize the time does not work. Try to plan your weeks including time for incidentals and for rest.
Delegate tasks: one can not do everything. Therefore, lean on people who offer their help or who think they can take care of what is not absolutely essential that you do.
Learn to say no: remember that you must strive for what is important (what is aimed at your goals) and not so much for the urgent.
Let go of demands and perfections for times when you have more calm. You have to do your best within the proposed term.
Try not to get distracted by things you can do at another time or, if you think about it, they are not so important and hinder you from reaching your goals.