I want to prepare for cat but now i have passed 12th so which coaching will be best 4 me.........and what should i do now.......

Hi,  I recommend you join Time Or IMS for cat preparation. The material of these classes is good. The teaching part though you have to put little efforts in clearing your doubts and all. There are professors that are good and some just teach for the sake of teaching. The test series of time is amazing. I will recommend their test series. You have 6 months for cat prep now.  Start with clearing your basics in the first 3 months. Then analyze your strengths and weaknesses and practice a lot of mocks fter this. CAT is not the game of just being able to solve a question but knowing which ones to solve and which ones to leave and how fast you can solve it. Hope this helps.