Could you suggest me the best game for learning root words,prefixes and suffixes in English which i need while preparing CAT...

I am a CAT 2013 Aspirant,I learnt from my faculty that "learning root words,prefixes and suffixes" is the best way to learn a large group of words.I need to improve my vocabulary as there is only a little time left for CAT 2013.Suggest me any type of games / shortcuts / techniques to learn quickly.