Dear Akshit,

don't lose hope if you got fewer marks in Jee-main exams. some better option for you that will help you to crack better placements.

some colleges are:
SRM, VIT, LPU, Amity, Chandigarh University, KIIT etc.

check it out below link that will help you out to know  about more colleges in India:
https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India

good luck

50 marks in jee mains are too low to get into any college under MHRD so i will suggest you to look for the best state college in your state if the governing body of those colleges considers your jee main marks as a criterion for entrance into them.

Best of luck!