The Medford Public Library is hosting a 10-week U.S. Citizenship Test Prep Class directed by the St. Mark Community Education program of Dorchester.  The class will meet from 10 a.m. to noon on Saturdays from September 9 through November 25 (no class on September 23). You will learn how to prepare for the reading and writing test, as well as answers to the 100 civics questions. Participants will need an intermediate level of English proficiency, and hold a legal Permanent Resident Card for five years, or for three years if married to a U.S. citizen. To register go, to www.stmarksesol.org or fill out an application at the library Information Desk.