Obviously Matrices and determinants are the easiest chapters to study. If you have a knack for differenciation, then that is also a very easy topic. Vector algebra and probability have some tricky questions, but if you work on them, then you can easily pass KEAM. Sets, relations and functions, PMI, Permutations and Combinations, binomial theorem are all very easy and will help you to easily score pass marks in KEAM.

If you have more doubts, feel free to ask!