Dear aspirant 64 percentile in jee mains is not enough percentile to get a decent college.you have got good marks in 12th board i appreciate it.you can see cutoff over here.I think it would be harder for you to get as per you desire.But again u can check it over official website of jac universities.

Dear candidate........,

Well, securing 64 percentile in Jee Mains may not be enough for getting admission into a reputed government engineering college in Delhi. But still you can give it a try at the time of counseling and since you're a resident of Delhi, you have higher chances of getting admission. But you can also apply for other deemed universities and private colleges offering B.Tech course in mechanical engineering through JAC. 

Feel free to ask your queries......

ALL the best:)