you need office for Mac..its hard to find free versions/pirated versions of those..but asking ur university is a good suggestion, usually they sell it for cheap (atleast most schools)..also Microsoft website has some deals occasionally for students with valid school email on MS Office and Windows package..so check their website too..
If nothing works..believe me ..sell that Mac and get a functional windows and install office..it will also put some money back in your pocket as well as you will have a much better functionality in my opinion..