This updated edition prepares students to succeed on the SAT Subject Test in Biology E/M (Ecology and Molecular). This comprehensive manual presents: a short diagnostic test; two full-length Biology E/M practice tests; all test questions answered and explained; a test overview and an extensive subject review of all topics covered on the exam; and, more than 350 additional practice questions with answers. The practice tests reflect the actual test in format and degree of difficulty. BONUS ONLINE PRACTICE TESTS: Students who purchase this book will also get FREE access to two additional full-length online SAT Biology Subject Tests with all questions answered and explained. The online exams can now be easily accessed by computer, tablet, and smartphone.