In May, a trustee of the Schenck School in Sandy Springs gave students who were moving on from the school a challenge: save your change. Each student took home a small bank to keep the money in, the school said. The trustee, Andrew Sullivan of Sullivan and Schlieman Wealth Management, pledged to donate $2 for every $1 the students collected. In October, the students returned for the school’s “alumni day.” When their banks were opened and the collected change counted, they had raised $1,115.81. Sullivan added $2,231.62 to make a total of $3,347.43. The school, founded in 1959, was the first school in the southeast for children with dyslexia.