It is one of the (i think 6) sections of the PAT. So, to make a long story short, it is... For me, that was one of the easier sections of the PAT, but every person is different. I struggled with the 2-D to 3-D line/dash representations. My recommendation (which is what kaplan and all the others tell you) is to take pieces of paper, cut them into a square and fold and cut. It gets your mind used to the concept.
Good Luck!