ILTS Science: Biology (239) Study Guide 2027–2028 | Illinois Biology Teacher Licensure Exam Prep, 2 Practice Tests, 200 Questions (PDF)

Prepare for ILTS Science: Biology (239), the content-area test for the Biology designation of the Illinois science endorsement (grades 9-12). The 13 sections follow the five official subareas and 15 objectives in order, including the general-science core (chemistry, physics, Earth and space and environmental science, practices, crosscutting concepts and science reading) that makes up 60% of the test.

What's Inside

• Exam overview: 100 multiple-choice questions, 3 hours 15 minutes of testing, the five subareas and their weights, the 240 passing score, the on-screen calculator and periodic table, and the $110 fee

• Subarea 1: science and engineering practices, the seven crosscutting concepts and reading and literacy in the science classroom

• Subarea 2: core ideas in chemistry, physics, biology, Earth and space science and environmental science, each with engineering design and teaching

• Subareas 3-5: biochemistry and energetics, cell biology, molecular biology, genetics, evolution, ecology and the unity and diversity of life, with lab safety and teaching strategies throughout

• Worked examples with numbered steps, 16 diagrams and graphs (cell cycle, replication fork, Punnett square, energy pyramid, enzyme energy diagram and more) and 120+ quick-reference tables

• Study schedules, FAQs and test-taking strategies

• 2 practice tests of 100 questions each, 200 questions total, weighted by the official subareas, with a complete answer key and an explanation for every question

Format

• Instant digital download (PDF), 8.5 × 11 in

• Clickable table of contents

• Print it or study on a tablet, laptop or phone

Please note: This is a digital product. No physical item will be shipped.

This is an independent study resource and is not affiliated with or endorsed by the Illinois State Board of Education, the Illinois Licensure Testing System or Pearson.