Exams for this level typically focus on several core areas of biology and physics: www.twinkl.com.co Natural Science 3º Primaria PDF - Scribd
Also, I should consider the educational objectives for 3rd grade. In Natural Science, the focus is on developing basic scientific concepts, encouraging curiosity, and fostering understanding of themselves and the world around them. So the exams should reflect this by testing knowledge of the human body systems, ecosystems, materials, and changes in nature.