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Pick a unit to drill it head-on. Each unit has 4 different test variations so you can keep retaking until you master it.
Plate tectonics, soil, atmosphere, biomes, and ecosystem services.
6 questions · ~9 minsmall bank — variations may overlap
Species diversity, ecosystem stability, and ecological succession.
6 questions · ~9 minsmall bank — variations may overlap
Population dynamics, carrying capacity, and human population growth.
6 questions · ~9 minsmall bank — variations may overlap
Agriculture, forestry, fisheries, mining, and urbanization.
6 questions · ~9 minsmall bank — variations may overlap
Renewable & non-renewable energy, fossil fuels, and conservation.
6 questions · ~9 minsmall bank — variations may overlap
Air, water, land pollution; climate change; and ozone depletion.
6 questions · ~9 minsmall bank — variations may overlap
How unit tests work
AP Environmental Science (APES) is an interdisciplinary college-level course that blends biology, chemistry, earth science, and the social sciences to study how natural systems work and how humans affect them. Its nine units span the living world and ecosystems, biodiversity, populations, earth systems and resources, land and water use, energy resources and consumption, atmospheric pollution, aquatic and terrestrial pollution, and global change including climate change and ozone depletion. The course is built around scientific practices: analyzing data and visual models, designing investigations, applying quantitative methods, and proposing and justifying solutions to real environmental problems. A distinctive feature of the exam is its mathematics. Even though much content is conceptual, the free-response section includes a question requiring calculations, and students must perform unit conversions, dimensional analysis, and percentage and rate computations, often without relying on a calculator's shortcuts to set up the reasoning. Many students underestimate this quantitative demand and lose easy points by failing to show work or mislabeling units. Another frequent challenge is the breadth of vocabulary and case studies, from specific pollutants and laws to ecological relationships, which rewards consistent review over cramming. The free-response questions emphasize proposing solutions and justifying them with evidence, so practicing clear, specific, well-reasoned answers matters more than listing facts. Strong preparation balances memorizing core terminology and environmental laws with developing fluency in data interpretation, calculation setup, and solution-based argumentation. Because the exam connects scientific concepts to policy and human impact, students who can link cause and effect across natural and human systems, and who practice released free-response questions against official rubrics, are best positioned to earn a high score.
Two sections over 2 hours 40 minutes: Section I is 80 multiple-choice questions in 90 minutes (60% of the score); Section II is 3 free-response questions in 70 minutes (40% of the score), consisting of one designing-an-investigation question, one analyze-an-environmental-problem-and-propose-a-solution question, and one analyze-an-environmental-problem-and-propose-a-solution-with-calculations question.
Section I (60%) and Section II (40%) combine into a composite that is converted to the reported AP score of 1 to 5.