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High school-level biology, chemistry, and physics are all available on Khan Academy!
Physics: https://www.khanacademy.org/science/physics
Chemistry: https://www.khanacademy.org/science/chemistry
Biology: https://www.khanacademy.org/science/biology
These are all content pages, so you'll have to select the appropriate topic to practice within for your tests. For example, if you're studying for a kinematics test in your science class, go to the physics sections and you can work through the motion concepts on Khan Academy.
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