The ignorance here is just shocking.
The email posted above is indeed sent by Tejashree Kumar from HR Flight Ops.
Its time you guys understand that by just knowing what 'static lateral stability' is, you will not get employed. You need to prove your brain power along with your technical knowledge.
The next round is the first of its kind that Jet is using. There is no preparation needed for Group Discussion rounds as, if you bother to 'Google' it, you'll (hopefully) understand that you have to show your ability to think practically and rationally other than just mugging up GSPs and Oxford books.
Of the fact that Jet Airways is being so helpful in describing the process so well and the preparation required, unlike a certain CAE recruitment drive, needs to be admired and highly appreciated.
They are actually sending out emails to people who didn't get through the written exam as well. They have better things to do but they're still doing it.
Just something to think about.