To use your checklist, simply work your way through it in order, dealing with the A priority tasks first, then the Bs, then the Cs, and so on. As you complete tasks, tick them off or strike them through.
To be well organized in the workplace, you need to be using To-Do Lists. By using them, you will ensure that: You remember to carry out all necessary tasks. You tackle the most important jobs first, and don’t waste time on trivial tasks. You don’t get stressed by a large number of unimportant jobs. - Start by listing all of the tasks that you must carry out.
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.
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.