I m doing bba(h).Should i start preparing for CAT in my 2nd year or 3rd year or should i take a year off for the preprations of CAT ??

Start preparation from 2nd year. You have the following options 1. Self-preparation. I would suggest the following books for preparation Quantitative Aptitude - Trishna Verbal Ability - Norman Lewis for vocab, Wren and Martin for Grammar, Arun Sharma for verbal reasoning Logical Reasoning and Data i

yes you can start study in 2nd year for graduation for clear or good score in CAT test