Yes I meant currencies. It’s all been said before in this thread with some full worked examples if I recall, you might want to read through. Anyway as I can’t sleep here is some more insight…
You will typically be given 2 conversion rates say $1.4 per £ and $1.2 per € you will then be asked how many euros would you get for "X" amount of pounds for example. So you either need to calculate the €/£ rate from the two rates given, or convert the original amount to $ using one rate then back to €.
That as hard as it gets. Other conversion are just simple ones like converting miles to km etc(you don’t need to memorise conversion rates they give them)
Its quite easy to get them all done in order and finish well inside the time limit you just need to be able to multiply and divide quickly on paper and have a comprehension of how conversions work.
Good luck.