I accepted several versions of the argument. I will only indicate what I think of as the best two. A number of people added a premise more clearly linking having problems with having a hard curriculum. It isn't completely necessary, but it makes the argument clearer to understand. Only if they are quick and capable readers can students easily master the books required for the English courses here.
Many students are poor readers.
Those who call our English curriculum easy are simply wrong. If many students have problems, then the English curriculum isn't easy. Being a bad reader is not by itself a reason for having problems. It is only when 1 and 2 are combined that there is a clear reason provided to believe 3. Looking ahead, the Labour Department sees manufacturing's share of non-farm jobs dropping significantly.