Learning morse was one of life's great drags. Just old fashioned, hard, repetitive, boring slog. I had a couple of long play records - or was it one - and just did it all over and over again until magically the old brain started just hearing letters as the code beeped out. Slowly but surely I got them all. The test was, I think, 10 groups (2 or 3 letters) per minute. And I think you got each group twice which was just as well. This was for an instrument rating in the mid 70s. I remember about half of them.
QNH - I thought this was Question Nautical Height.