Principals said that schools would call students in a staggered manner to prevent overcrowding on the campus. RANCHI: Principals of several schools have demanded resumption of offline classes for all students with the proper safety guidelines from the new academic session starting in April. They said that schools would call students in a staggered manner to prevent overcrowding on the campus. The views were expressed during a meeting of principals with education secretary Rahul Sharma on Wednesday. Heads of more than a dozen prominent schools -- including Delhi Public School, Jawahar Vidya Mandir, Bishop Westcott, St Thomas and DAV schools -- attended the meeting.