Here's the link to the Memory Test created by the University of Edinburgh. Click where it says "Click here to start" to begin the exercise. It will take you about 20 minutes, and you will do the best if you are not disturbed or distracted during completion.
You will not be diagnosed with a "good" or "bad" memory on the basis of your results, though you will be provided with an explanation of some known phenomena about memory.
If nothing else, it's a fun challenge and a great illustration of some of the ways that memory is assessed.