The Center for Computer-Assisted Legal Instruction (CALI) provides online interactive tutorials on legal topics. Your Legal Research professor or a law librarian at the reference desk can provide you with Mercer's access code so you can create your own password.
Law School Survival Manual: From LSAT to Bar Exam by Nancy Rapoport
Reserve KF283.R37 2010
Open Book: Succeeding on Exams from the First Day of Law School by Barry Friedman
Reserve KF283.F75 2011
Mercer Law professors may have their prior exams posted on their course web pages.