The exam evaluates concepts in biology, chemistry, and physics, focusing on the human excretory system, atomic structure, and tectonic plate movement. Key topics include photosynthesis, sound waves, conservation, and the relationship between density and mass. Practical applications emphasize data analysis, experimental design, and environmental issues, such as sea-level rise and extinction. Questions explore energy transfer, resistance, chemical reactions, and stellar formation from nebulae. Keywords: excretory system, atomic structure, tectonic plates, photosynthesis, sound physics, environmental science, energy conservation, density, chemical reactions, Cambridge Checkpoint, STEM education.