Recently, The Art of Manliness provided an historical look at checklists, along with a detailed primer in deciding which lists will work for you, culled from the excellent, The Checklist Manifesto. You can implement the same routine in your daily work to help give you a greater shot at success.
Run through these checklists allocating priorities from A (very important, or very urgent) to F (unimportant, or not at all urgent). If too many tasks have a high priority, run through the list again and demote the less important ones. Once you have done this, rewrite the list in priority order.
You may find it easier to compile several checklists (covering personal, study, and workplace, for example). Try different approaches and use the best for your own situation.
The checklists are prioritized lists of all the tasks that you need to carry out. They list everything that you have to do, with the most important tasks at the top of the list, and the least important tasks at the bottom.