hi , I am a first year preschool teacher with a few very challenging students. They refuse to join group lessons, leave for ancillary, or do their workstations. They constantly disrupt the class and take stuff of the shelves and make huge messes that I have to clean up . The administrators complained about them not participating and refusing to join the group . I have contacted their parents by phone , held a conference, and implemented a reward and consequence system . There is also the issue of me being a different ethnicity than my students according to the principal and the other teachers . Any suggestions would be appreciated. Thank you !