Keep the items you use regularly within easy reach. Be reasonable about what you really need to keep out.
Too many objects add to the clutter and eat up valuable work space.
Color–coded files are especially helpful — they show you at a glance where something should go. Label all files clearly and make sure they are easily accessible to prompt you to use them regularly.
It'll give you a feeling of greater control over your work environment, and that can translate to increased productivity. You'll also waste less time searching for things.
Get rid of anything unused or unnecessary. Install drawer organizers. Hang on to only what you know you'll need.
Don't allow things to pile up. Put items that must be looked at in a special folder or file.