To clairfy on the "vous" issue: I used "Demain, vous choisirez vos manuels scholaries". I don't see a difference between the correct answer and mine other than switching to vous.
You misspelled "scholaries".
Shouldn't the students choose their courses and then be assigned textbooks accordingly? Why would they choose textbooks?
True. Textbooks are generally not optional.
Ha ha, my thought too
I wrote "vous allez choisir" vos manuels... (I didn't remember "scolaires", so I would have been wrong anyway, but I was just wondering...