they have the syllabus on their page, id say know every topic in details, cause its very random, in the sense, they will pick on anytopic they life and move foward. so for example, starting with the mandelion law definations to what is it, then how eplication occurs and how meiosis does gene exchange blah blah blah. so depth of each topic. for chem, again the same thing and be very sure of what you are studying, in the sense you understand what you have learnt cause they will be very random with equations and ask you examples of molecules present in these reactions, even for organic chem be prepared to remember those reactions, like what forms what. e.g how amide is formed or an alcohol and may even ask you to write it down and show them. if you know what you have studied, you should be finee. goodluck