Almost all colleges have an entrance exam. They just have a criteria of getting at least 60% in 12 th boards.
Give a the entrances and decide your college.
All the Best :)

Hello,
Only few colleges accepts class 12th board exams marks while most of the colleges accepts admission on the basis of engineering entrance exams like jeemains and advanced,bitsat,viteee,srmjeee,upsee,wbjee,comedk,kcet,..and many more.
Good luck.

No there is no such eneterance in every engineering college