How to have three different condition in If and Else statements in excel?

I'm currently revising for my exams and have worked out how many pages to do every day. I would like to have a cell where it says which subject out of Biology, Chemistry and Physics I need to revise most for because it's pages per day number is higher than the rest. I know about If and Else statements in Excel but have no idea how to actually apply them. I can make it tell me between two subjects by inputting this: =IF(I4 > I8,"Biology","Chemistry") but have no idea how to make it tell me between Chemistry, Biology and Physics. All help appreciated thanks!