hello sunny, as u r from mumbai, you sould secure above 65% in 12th so as to get admission in good college in india. try to clear ur basics, inculcate the habit of asking more n more doubts to teachers. even though u get gud marks in entrances, most of the colleges select students on the basis of ur 12th score as well as entrance test score treating equal. start searching info on internet, it will be much useful to u. best luck

you just need 60% in 12th boards.. and a good rank in engineering entrance exam to enter into a good college.