Yesterday, police fired rubber bullets when protesting students tried to access the Great Hall.
Student leader Shaeera Kalla was shot at least 10 times in the exchange with other students injured.
But Wits says classes went ahead amid yesterday's violence.
She says the university will tighten security at all lecture and test venues today.
Meanwhile, students are expected to have a mass meeting today to discuss the way forward.
At the same time, Wits deputy vice chancellor Professor Tawana Kupe has pleaded with students to remove the violent element from their protest for free higher education to avoid injuries.