MPS: 59% of those surveyed opt for return to classroom MPS: 59% of those surveyed opt for return to classroom MPS classrooms are limited to between 15 and 18 students upon return. Those who declined, or did not complete the survey, will stay virtual. MILWAUKEE - Milwaukee Public Schools students in grades K-3 through third grade are set to return to the classroom Wednesday, April 14. How full each school will be varies greatly by the school. At Oliver Wendell Holmes School, 49% of parents said their child will return to in-person learning. And how many said "yes" will dictate what classes at the school may look like.