That was my guess, but I didn't want to be presumptuous. I tried with them and as well it didn't really stick. In my opinion "Learn You A Haskell" is a great supplememental reference, but a terrible teaching tool. And I think It's done more disservice to enforcing the reputation of Haskell being difficult to learn.
I highly recommend the lecture notes online from the "Upenn Spring 2013 Haskell" class. Search that phrase and it should be the first hit (am on mobile).
Go through the lecture notes, and do all the exercises in the homework. (Link in purple at the top). It's a night and day difference from LYAH.
And you get to build some nifty real world style projects along the way.
