(In this five-part series, indianexpress.com talks to alumni from the first batch of first-generation Indian Institutes of Technology (IIT). They tell us about the admission process back then, academic pressure, campus life, and how they bonded with their fellow students and faculty.) Lalit Mehra would have probably completed his Maths Hons from St Stephens College, had he not heard of the establishment of the College of Engineering (CoE) in 1961. After finishing his first year at the Delhi University college, he took admission at the CoE which was renamed as the Indian Institute of Technology (IIT) Delhi in 1963. His…