Interactive test preparation
Learning Express, online interactive Test Prep materials are available through the New York Public Library and Brooklyn Public Libraries. To access the materials from home you must login with your public library card.
Find GRE test prep under COLLEGE STUDENTS New York Public Library / Brooklyn Public Library
Sample tests available through Lynda.com at New York Public Library / Brooklyn Pubic Library (search for GRE)
The Official Guide to the GRE General Test, Third Edition by 
The 5 Lb. Book of GRE® Practice Problems by