Mostly it has 2 sections. One of general aptitude which was quite easy but the other of the technical aspects was bit difficult with questions mostly on thermodynamics, engines and their characteristics. But as such section two does not matter that much as more or less everyone would end up getting similar score in it. Better focus on the aptitude!
The first of the two interviews. They shortlisted 3 from about 30 students who gave exam. General understanding of the concepts is checked.
Only one was shortlisted from the first interview for the second. It was more difficult, focused on specific subjects like metallurgy, thermodynamics, statics and dynamics and lastly HR