The original post said that the teacher wanted to dictate notes and that would also improve the spelling. It didn't say "The teacher dictates the spelling words." Unless the teacher corrects the dictated notes, how does the student learn whether he or she used correct spelling as the notes were transcribed? Yes, the chalk board exercise would work, but is there one student up there writing the notes on the board as the teacher speaks? Does the teacher stop if the student at the board makes a spelling mistake to correct the mistake and then resume dictating his/her notes?
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
Suppose the teacher has dictated the one page notes, she will now correct the note books of the students to see whether they have made any mistakes or not. If there are some mistakes ,she will correct them.