I am thinking about trading in US and International stocks. I found plenty of information on how to invest in US but couldn't find any reliable information for international stocks. Is day trading possible for internations stocks?

I will appreciate any information.

ADRs are important vehicles for investments in foreign assets. Google it.

invest in international mutual funds, they've become a very integral part of portfolio planning nowdays.

On a different note,

One of my friends was thinking of giving CFA exams right(a couple of months) after his undergraduate degree. How feasible is that and how does it affect his OPT and F-1 status?

What do you guys suggest?

Oh you wanna do international business huh? then to start up you have to find one successful businessman in relative field and su(k his Di(k, got that, its that simple.