I would simply start with a seed of thought in our minds by the following - "Managing your time without setting priorities is like shooting randomly and calling yourself that you hit THE TARGET"
Task Management mainly focuses on to manage the tasks in a pre-defined manner in an order of priority. Inculcating the habit of managing task always helps in getting an edge over others and living a systematic life. It's not the only key to success rather I would say its the stepping stone to success.
Sharing my personal experience, I would add that while preparing for my FINAL exams I prepared my task management schedule in such a way that in 4 months I could revise all eight subjects thrice in a very profound and systematic manner. At last when exams were nearing, I was very confident and satisfied about my planning and the path I took. Because I have known people struggling with the courses at last minute. I strongly believe that if you have a strong plan and you become disciplined to it, SUCCESS is at your door.
As a discipline, Task management embraces several key activities, various conceptual breakdowns exist and these at a high level always include creative, functional, project performance and service activities.
As a student and as well as a professional, we find ourselves always burdened and occupied but sometimes we realize that we end up doing the non-core tasks and the critical ones gets left out.
One must always make a practice to manage the entire day or routine in advance so that the important and critical tasks are not left out. Implementing discipline in every walk of life would always contribute towards being ahead of many in several aspects.
"One worthwhile task that brings a successful conclusion is better than a hundred half-finished tasks."