MONROE - A former Northside student will be stepping up to the head of the class as she takes over for her fifth-grade teacher, who is retiring after more than four decades on the job. Randy Ninmer, who has taught at Northside Elementary School for 43 years, will retire in June at age 65. Former student Katie Coplien, who got her teaching assistant experience at Parkside Elementary, is set to take over his classroom in the fall.