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It's mostly a math/reasoning test to check their algebra/trig skills. Also
a few metric conversion to see what they know. Only takes about 30 minutes
to do. You don't want to scare kids away from physics -- some kids are
"rusty" from the long summer break. And there are those who might be weak
at math but can understand physics and do fairly well in the course. But
so far it's a fairly good predictor for me. And it's better to have this
information early on in the course rather than later, when it might be
difficult for kids to switch into another class.