FYI, with a fairly decent amount of prep, I think the hebrew regent is pretty easy. Getting back to the question, I think they have a hebrew section in some of the magazines. (Mishpacha, Olemeinu) I’m sure that would give him a start at least. (The harder words are translated)
OR,
just sit down and familiarize yourself with standard verbs in hebrew. Once you know what the basic word means, its easier to deal with the dikduk.