BACK TO SCHOOL:At left, Jennifer Merlo, a second grade teacher at Riker Hill School, gets some help from her daughter, Abby, in preparing her classroom for the start of school on Tuesday, September 3. Above, custodian Ewan Douse makes repairs at Burnet Hill School ahead of the return of students. At right, media specialist Susan Tannler places books on display in the media center at Heritage Middle School