If you find that you never manage to get everything done, or if your life is a bit disorganised you may find it helpful to make a weekly plan.
Here is a very simple (and completely free!) weekly planner in an Excel spreadsheet. The best way to use it is to print out a set of them (the whole week fits on one A4 page) and then at the end of each week plan what you will be doing for the next week.
You can download the weekly planner from this link: Week Planner in an Excel Spreadsheet (15kb)