It depends on university as it varies according to them for majority it is 75% it is also 45 % for many of them so it varies according to university

Hello
Engineering is among the most preferred course at the present time who has done 12th from a recognized board with physics, chemistry and mathematics.

The minimum percentage of marks required to get admission in engineering is 45% from a recognized board. So even if you have equal to or more than 45%, you are eligible for any stream of engineering.

Joint Entrance exam is conducted by IIT for admission in engineering college last like IIT, NIT and other government engineering colleges. Percentage scored in 12th board is vital in admission, so you must aim to score as high as possible in 12th board.

Goodluck I hope this helps you