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With good scores in Joint Entrance Examination (JEE) mains you will get seats in NITs and IIITs which are considered top colleges compared to the colleges which you get writing state level exams. If you have got better score in  Joint Entrance Examination (JEE) mains you will get a chance to give  Joint Entrance Examination (JEE) advanced and with good rank in Advanced exam you will get seats in IITs which are the top colleges in India. Being top college you will have better placements with high packages and other wonderful opportunities to get better success. Which is why many apply for JEE.