Obviously students have the Zimbabwe government running scared. They have ordered the schools not to re-open in two weeks and only re-open in two months after elections. There has been demonstrations in the past over rigged elections.
So… Rather than go to every effort to make sure the elections appear legitimate, the approach is to take a preemptive strike against the students. The students should take to the streets now (or in two weeks when their schools do not re-open).