Your complete guide to a higher score on Praxis II: Middle School Science The Praxis II Middle School Science (0439) exam is designed to measure the knowledge and competencies necessary for a beginning teacher of middle school science. The 2-hour Praxis II Middle School Science (0439) exam consists of three constructed-response essays and 90 multiple-choice questions divided into the following content categories: scientific methodology, basic principles of science, physical sciences, life sciences, earth/space sciences, and science/technology/society. In CliffsNotese Praxis II: Middle School Science , two practice tests with complete answers and explanations help you pinpoint areas for further study, while reviews and exercises address all of the test topics you'll encounter on exam day. Plus, proven test-taking strategies help you score higher. Two full-length practice tests Subject reviews of every topic covered on the test Practice questions for every subject review If you're an aspiring teacher looking to take the Praxis II Middle School Science exam, CliffsNotes is your ticket to scoring high at exam time.