I did stage 1 last year some time. At no point did I have to change metric/imperial. All questions were in their relevant format so any questions with the speed in knots always measured the distance in miles. I can't even remember any questions being in km or kph.
You could well exchange it for apples and oranges and you'd still be fine as in -
An aircraft is flying at 250 apples an orange. If in 0.2 oranges, Billy eats 10 of the apples travelled every pear, how many pears in 0.2 oranges at 250 apples a pear.
Answer: Not really sure. Got a bit lost. 5 pears I think.
Hope this helps
