This is a list I gave to maths_genius246 (very late but ehhh XD)
Science
• Body systems (main organs and functions)
• Atoms (basic structure, bonds, metals, etc)
• Chemical reactions (reactants, products, balancing)
• Acids and bases
• Energy
• Electrical circuits (parallel and series, Ohm's Law, etc)
• Plant and animal cells (structure and organelles)
• Evolution (adaptation, natural selection, etc)
• Forces
• Trophic pyramid
• Ecosystems (biotic and abiotic factors)
Maths
• Quadratics (factorising, Null factor law)
• Parabolas
• Trigonometry (SOH, CAH, TOA)
• Pythagoras
• Angles
• Algebra and linear algebra
• Simultaneous equations
• Measurement (perimeter, area, volume, surface area)
• Surds
• Indices
• Inequalities
• Circle theorems