Cut these out and put them in your pocket. Whenever you have a free moment - on the way to work or during coffee breaks - flip through them to review the vocabulary. PDF document, so you can print and cut the cards yourself.
allows you to have vocabulary tested. You've got statistics, so that you know how many words you know, and you can define the tests very precisely. popTest comes with a simple main menu, meaning that you can start the tests right away, simply by clicking on "Start tests". You can afterwards look at the stats, or define the tests more precisely by clicking on "Preferences".