Your advice is way too simplistic to be of any use. Plus there are Errors in what you have told. Everybody knows you have to slog really hard for the CAT, that you need to improve maths, Data interpretation and reading skills. what new perspective have you added. Apart from that, mugging wordlists is going to take you nowhere in CAT. CAT does not test you on vocabulary. You probably got confused with other exams like GRE, XAT, etc, which do test your knowledge of obscure English words.