Jamie MacDonald often talks about the students she’s working with at the Raymond Elementary School in Brockton. She began student-teaching fifth graders there in January.“The students are amazing,” she said.The East Bridgewater resident works in the extended-day program and loves the work, except for one aspect: She is saddened to see how the lack of supplies affects the students. This is another thing she talks about. It's her way of advocating on the students' behalf.