You can get control of your tasks and activities only to the degree that you stop doing some things and start spending more time on the few activities that can really make a difference in your life.
No matter how many personal productivity techniques you master, there will always be more to do than you can ever accomplish in the time you have available to you, no matter how much it is.
Your ability to select your most important task at each moment, and then to get started on that task and to get it done both quickly and well, will probably have more of an impact on your success than any other quality or skill you can develop.
Your most important tasks and priorities are those that can have the most serious consequences, positive or negative, on your life or work. Focus on these above all.
You perform at your best when you are working continually on high-priority goals and objectives.