Yes, you can access test preparation materials through these databases:

LearningExpress Library
You must register for a personal account to use the wide range of tests, tutorials and ebooks for adults and children. Includes college and graduate school admission tests, career exams, skill building in math, reading, grammar, writing and sciences, U.S citizenship exam, and some materials in Spanish.

Mometrix eLibrary
Access free test preparation materials for career and professional certifications in areas like teaching, nursing, social work, finance, and law enforcement as well as the major grad school admissions exams. Some resources for K-12 audience.