This means that each student works on a presentation for his/her grammar section. On the day of the presentations, all the students get to see presentations on all the grammar structures that were learned that term. I have found that this system really gets the students to work and truly understand their grammar part, and by seeing other students explaining their part, helps them to absorb the material presented in another way from the teacher's style. The teacher can also tell the students after the presentations that if they have a particular problem with one of the structures, they can ask the student who presented that part, for help.
Try it out and send some comments.