At least in the USA it's my experience that when people say "Asia" they mean maybe what some other people would describe as "East Asia." This has been true my whole life, despite there usually being someone there to say "but what about India?"

Not by a long shot. You read that in India English is sort of an official language. But in truth, a big chunk of the population still doesn't speak it, and the ones that do often have a thick accent and not a very rich vocabulary. Source: been to India ~25 times.

In my exp, an average Indian person without a university education does not really speak or understand English.