Try not to be put off by the units of measure in the SDT questions at NATS. They never require conversion. so Knots = mph for the purposes of this test, as real mph is never used.
FL320 - FL 250 is merely the way Air Traffic call 32,000 feet to 25,000 feet. Again, there's no need to convert to metres at any point at all.
As for the questions, both those quoted and posed by yourself would be equally likely to come up in this sort of test.
Phil