"Kaplan SAT Subject Test: Biology E/M includes: 
2 full-length Biology E/M practice tests
A full-length diagnostic test
Focused chapter summaries, highlights, and quizzes
Detailed answer explanations
Proven score-raising strategies
Popular Test Periods: May, June, and November

SAT Subject Test: Biology E

Test Takers in 2006: 32,546

Test Takers in 2007: 33,599

Test Takers in 2008: 36,799

Average score in 2006: 591

Average score in 2007: 589

Average score in 2008: 593

SAT Subject Test: Biology M

Test Takers in 2006: 38,171

Test Takers in 2007: 40,235

Test Takers in 2008: 39,523

Average score in 2006: 630

Average score in 2007: 630

Average score in 2008: 630

Many colleges use the Subject Tests for admissions and course placement. Used in combination with other background information (high school record, scores from other tests like the SAT, teacher recommendations, etc.), they provide a dependable measure of academic achievement and are a good predictor of future performance. Some colleges specify the Subject Tests they require for admission or placement; others allow applicants to choose which tests to take. "