Leaving One for Another?

[nushi]

Hello everyone,,,

Now I got accepted with an assistantship offer into a university in America. Still, this university is not my favorite option. So, I'm thinking about also applying to the Japanese government scholarship (next May), & to an Australian university that has a research center which I'm highly interested in its research (next July). But since I can't guarantee that I'll get accepted into any of these two scholarships, & I don't want to waste a year of my life, so I will meanwhile go to the American university, & start to prepare to travel there. & the results of the two Japanese & Australian scholarships appear after the start of the academic year in America!

However I I'd like your opinion about whether to go ahead & apply also to those two scholarships, especially two questions:

1) While starting my academic year in the American university, if I find out that I got accepted in the Japanese or Australian scholarship, is it possible to leave that university to go to the other one in either Japan or Australia?

2) Is it possible to do the visa procedures for traveling to Japan or Australia inside the US, although I'm Egyptian & not American?