THese days. I am trying to tidy up with my summary notes. I got surjective homomophism, isomorphic, and cyclic group, Subgroup, normal group, symmetric group, Quaternion group, and quotient group. How to distinguish them. Is there any tric to understand and remember these. I am completely mess up with these things. what I should do...!!~~ I being revising for 10days. Any one give me some suggestion.