sir, i would like to join in b.tech (mech) ,i have completed Diploma in 1996.
Hello Pandaurangam,
There is a very famous quote in hindi,
JAB Jago Tabhi Savera, that means It's never too late.
So if you think that you can do it and you have keen interest to pursue higher studies then sure , you must join for Graduation in your desired stream.
Good Luck.