The chairwoman of the state Board of Education has apologized after accusing the Providence school superintendent of “grandstanding” following her testimony in opposition to a new high school graduation requirement. The Providence Journal reported that Eva-Marie Mancuso apologized at Monday’s meeting for her comments about Superintendent Susan Lusi. Several of Mancuso’s fellow board members criticized her for the remarks. One said that when superintendents speak up, the board should listen. Lusi testified last week before a House committee that she could no longer support using the NECAP test as a graduation requirement. She argues that the test is unfair to students who contend with poverty, poor English skills, or special learning needs.