Found this out the hard way. After months of using mechanical pencils, I randomly took a PT. Half way through the LG section I recall thinking to myself, "Gah! I need at least 8 pencils to take this test..."
If you've got the time, there's nothing like the real thing. Clean copies on paper with pencil. It will take awhile though. If you're short on time, @katherine.t 's method sounds like a really smart alternative. Good thinking KT.
... first one, it grinded the pencil effortlessly into a reeeeeally long ... part off. On the second pencil I sharpened it a bit ... /591215/tug-2-Hole-Manual-Pencil-Sharpener/ If you want a ...