I'm not really sure what a single item psychic test is. But psychic tests in general, for me at least, if I'm going to do well have to do w/a channel on the other side.
So, being asked if someone is telling the truth. Having someone thinking of an object (limited to circle, triangle, square, oct., etc.).
With the objects and someone projecting, I see, lines or half circles at the start. From there, the object forms as long as the person is focusing on them.
Lori's right, it can depend on strengths in certain areas. It also helps to start small, even if it's a 50/50 thing like black/red coloring from a deck of cards.
The important thing, once you get the basics, if you want to develop this type of "muscle" is to learn your type or your sense-type of deciphering what it is that's coming through.