They're good at pushing buttons on a calculator.
The second half of the test, given today, was a "calculator allowed" test. Most of the questions didn't require a calculator, even for a decimal/fraction-written exact answer. But there were a couple of problems that required them to pull variables out of an exponent, and they were able to do that just fine. With a calculator.
But they couldn't do similar problems yesterday, on the "no calculator" portion of the test. What gives? The steps are exactly the same!