Note: College Board has discontinued the SAT Subject Tests in the US. The tests will be available outside the US in June 2021 and then be discontinued. Barron s SAT Subject Test: Biology E/M with Online Tests features full-length practice exams in the book and online plus in-depth review of all topics on the test. Practice tests match the actual exam in format and degree of difficulty. This edition includes: Two full-length practice tests in the book with answers and explanations Two full-length online practice tests with answers and explanations One diagnostic test to help pinpoint strengths and weaknesses More than 350 additional practice questions with answers A test overview and an extensive subject review of all topics covered on the exam