The exam assesses scientific concepts including the human respiratory system, chemical reactions, light reflection, disease transmission, soil properties, planetary distances, heart rate variation, force diagrams, solubility and temperature, electrical circuits, rock hardness, and light properties. Key topics include air-to-blood oxygen transfer, magnesium reaction with vinegar, soil suitability for plants, particle behavior during dissolution, circuit brightness, and safe handling of materials. Skills tested are data interpretation, experimental design, observation analysis, and application of scientific principles. Keywords: respiration, chemical reactions, light reflection, disease control, soil types, planetary distances, heart rate, solubility, circuits, rock hardness, safety.