hello sandeep,

for applying for engineering you must have cleared 10 + 2 with physics , chemistry ,maths as your main subjects and you must clear engineering entrance exam.

Hello,
I would like to tell you that you would have to mention the exam name in particular as as a whole, engineering does not have much eligibility criteria.
It's just that you have to pass 12th grade.
But for particular colleges, particular examinations/entrance exams for engineering you are required to pass some eligibility criteria like 75% in boards  age limit or something else.
So I would suggest you to please mention the engineering entrance exam / college name you want to take admission in and we'll try to help you out further.
Hope this helps and all the best!