MBE prep bestseller. Higher score guarantee! Bar exam prep book with principles of substantive law governing the correct answers to exam questions. Thousands of students use Sterling Test Prep study aids to pass the bar. Since 1991, Sterling Test Prep prepares students for academic success. Sterling Test Prep publishes more than 140 study aids for high school, undergraduate, graduate, and professional students. Our writers, contributors, and editors are highly educated in sciences and humanities, with extensive classroom teaching and research experience. They are experts on preparing students for standardized tests, as well as undergraduate and graduate admissions coaching.