Prerequisite for Biology 20, Chemistry 20, Physics 20 and Science 20.
Below is how the official curriculum organizes it. Each strand will get full lessons like the ones in Grade 1 Mathematics.
Atomic theory, ionic and molecular compounds, acids and bases, chemical reactions
Kinematics, work, energy conversions and efficiency
Cells, transport across membranes, plant structures and processes
Solar energy, climate, biomes and climate change