Is this the test where you have to take 3 or 4 normal breaths, before exhaling (i)for as long as you can, and then (ii)as hard as you can, with one showing a series of circles, and the other a horizontal line?
If so, I too found that I wasn't scoring as well as I should have been, until I realised that I was breathing
too deeply during the "normal breathing" part.
