recommendation for book to learn hebrew

When my son learns mishnayos he uses the English Kehati series, which he has gotten comfortable with, but I am not very happy with that. One of the big differences between my girls’ school’s curriculum and my son’s school is that the girls learn Hebrew fairly well, i.e. they can take any pasuk in chumash and identify the shorashim of words, otiyot shimuch, etc., translate the words, and manage to speak and write a fairly understandable Hebrew. The girls’ school tries to teach ivrit b’ivrit but in chumash will do English translation for harder words; they also learn some grammar and are occasionally assigned “chiburim” to write. My son’s school half-heartedly uses the Lashon haTorah workbook series which my son admits to not pay attention to. They translate only into English, none of the Rebbeim speak Hebrew, and certainly none of the boys could engage in any conversational Hebrew. The result is that my son is chained to English crutches for his learning. Can anyone out there recommend a Hebrew workbook, audio program, or something that can jumpstart his learning and understanding Hebrew?

For the record, I am biased from my own experience and believe ivrit b'ivrit instruction is the way to go, but no boys school that I know of really carries it out. In the long run it makes a huge difference. Reading in Hebrew/Aramaic and then mentally translating sentence by sentence back to English is not the same as being able to read and undertstand a book/sefer in the language it was written in.