Clairvoyance is the ability to know things through use of your mind alone. It is one of the four basic psychic powers:
4. telekinesis, or psychokinesis
I can't measure the other three psychic powers with a test of this nature; however, I can set up a test that measures your level of clairvoyance right now - it can change as you exercise your mind.
I'm going to list groups of four items, and I'll arbitrarily assign one as correct within each group. There is no pattern to these correct answers, so select the one that just seems right to you at the moment, not necessarily your favorite. Think about each one, and simply go with your instinsts!