hello sarah , thank you for asking us! it would be lovely if we could do these topics : human digestive system (biology), cell division (biology) , ionic bonding (chemistry), history of atmosphere (chemistry) , states of matter , electricity specifically - circuits (physics) , trigonometry (maths) , volumes of cylinders and composite shapes (maths) , pythagoras theorem ( maths) , non-monic quadratics (maths) , factorising quadratics (maths) , homeostasis (biology) and simultaneous equations (maths). sorry for the long post... thank you in advance! x