i cleared my 12th and now i want to give an attempt for iit jee. what should i do.... should i take dropp or prepare for jee with college..

if you want an IIT for sure, i would suggest you to take one year drop and prepare rather than joining a college and prepare side by side because the burden of studies in college is also not that low. and believe me, an IIT name in CV is worth 1000 other points one mentions.