AP® Environmental Science, one system at a time.
Each topic taught from scratch for the May 2027 exam, then practice that checks your setup, your answer and its units, and answers specific enough to score.
Starts with your first answer. Every question, card and lesson earns XP toward one level that counts across every LevlPrep course, and a day of study keeps a shared streak going.
Introduction to Ecosystems
Unit 1 · The Living World: Ecosystems. Units 1 and 2 lessons and every notes page are free.
Start the first lessonMissed questions come back
Anything you miss returns when you are about to forget it, not on a fixed date.
Open review →A little every day
Questions, cards and tool steps count toward a daily goal and a streak shared across every LevlPrep subject. 15 practice questions a day are free.
Practice now →The path through the course
The units in framework order, then the math you need: scientific notation, rates and per-capita values, unit conversions, percent change and doubling time, each placed just before the topic that first needs it. Tap one to open it.
- UnitsUnit 1: The Living World: EcosystemsStart here · 11 topics · 6–8% of exam
- Unit 2: The Living World: Biodiversity7 topics · 6–8% of exam
- Unit 3: Populations9 topics · 10–15% of exam
- Unit 4: Earth Systems and Resources9 topics · 10–15% of exam
- Unit 5: Land and Water Use17 topics · 10–15% of exam
- Unit 6: Energy Resources and Consumption13 topics · 10–15% of exam
- Unit 7: Atmospheric Pollution8 topics · 7–10% of exam
- Unit 8: Aquatic and Terrestrial Pollution15 topics · 7–10% of exam
- Unit 9: Global Change10 topics · 15–20% of exam
- Math you needMath you need5 topics
What the course covers
9 units and 99 topics in the order of the course framework, for the May 2027 exam, plus 5 math topics placed where they are first needed. Each topic has an interactive lesson, a free notes page and exam-style practice, and each unit a printable unit sheet.
1,625 practice questions, many in sets that share one data table, graph, model or passage, as on the real exam. Every option has its own explanation. Practice checks what the exam's readers check: the setup typed with brackets and units, the answer, and its units, each marked on its own, with the slip named. There is no formula sheet on the exam, so the formulas you must memorize have their own page and flashcards.
All 104 topics are built, each with its lesson, notes and questions.
How to use it
- Read the lesson. It checks what you need first, then walks the cause and effect one step at a time, with a picture for every process.
- Answer as you go. Anything you miss goes into your review queue and comes back when you are about to forget it.
- Train the hard parts. Calculations, cycles, energy flow, population growth, pollution chains and the greenhouse effect, each checked step by step.
- Check your mastery. Your dashboard shows it by unit, topic and skill, and every miss links to its lesson.
Twelve trainers for what the exam marks hardest.
Type a calculation as the exam's readers grade it and see the setup, answer and units marked; move energy up a food chain, tap a step of a cycle, overshoot a carrying capacity, run smog through a day, then answer the questions about what you saw. The calculation studio, energy flow and cycles trainers are free.
Practice and study
- PracticeDrill a unit, a topic or a skill, with data, model and passage sets.
- ReviewMissed questions come back when you are about to forget them.
- ExamsUnit tests and full timed practice exams in the May 2027 format.
- Free-response practiceThe three free-response question types, with 10-point rubrics and sample answers.
- Make it specificHypotheses, chains and solutions specific enough to score, checked against a rubric.
- Cram kit3-week and 2-week plans to exam day, and timed mixed sets.
- FlashcardsSpaced-repetition cards from the glossary and the formulas.
- ToolsTrainers and simulators, then the questions about what you saw.
- DashboardMastery by unit, topic and skill.
- GlossaryEvery term, with a plain definition and where it is taught.
- Formulas you must memorizeThe exam gives no formula sheet: every equation you need, when to use it and the classic trap.
- Free unit practice testsA free sample test for every unit, with every option explained.