1) Ji is a respectful form of address. Everyone calls their elders or someone in a respectful position as Ji. I’m sure you call the Brahmin rickshaw driver, servant, labourer as “ji”. If not then reflects your class bias.
3) LOL, all public places are open for the public.
5) Really weird, if you keep discussing caste with your co-traveller whom you won’t ever meet again, you’re weirdly obsessed with caste. Do you do such things?
7) There’s every possibility that I or any GC will never make it to this interview board despite scoring high marks.