Constant personalized attention (I know as a teacher that's tough) is what kept me OP with my novel writing class in high school. We all registered for NaNoWriMo and wrote what we could of a novel before the class ended, then marketed and pitched it to agents and publishers.
Bc of that our teacher held meets with us many times that were requirements. During that time she went over our novels with us personally. We also held workshops as a class for novel-building. Idk maybe more involvement w/ each other helps? Bc it puts them to a better standard?