Do the US/Canadian Universities accept 3 years undergraduate in Environmental Science (from Nepal) for MS? If anybody knows, it will be great help for me. If yes, should we have to do pre-MS course or can continue as regular? Do they give assistantship for such student?
Is there any Universities in which we don't have to take pre-MS course? Please suggest how to proceed.

Oh boy, another sheeple in the making.
harikancha bro,don't go to college. Colleges don't help you in getting experiences in life. See, I work at the docks and the $$$ I make is so much better than any college graduate would make. And colleges will brainwash you and make you a socialist. They're like liberal training grounds for young adults who don't know any better. Bro, take my advice and find a job.

nepali con, harikancha has already finished college. if only you had been here three years ago...oh well...

Harikancha, as far as I know you should complete 10+2+4 years to enter graduate level in US universities. I also came here after I finished M.Sc. from TU. Universities provide assistantship only to graduate students. My suggestion would be to do Masters there in Nepal and try for US universities. If I can be of any help to you let me know.

धन्यवाद बेंगाल टाईगर!! What about pre-MSC. I guess nowadays, KU offer one year pre-ms course to acheive 16 yrs education for one who did 3 yrs undergraduate. Is that ok? What do you suggest? 1 yr pre_MS course at KU or 2 yrs MS at TU? BTW, bengal tiger are you also in Envt Sc?

Harikancha, I don't know the validity of 1 year pre-MSC course at KU. I think they started it recently. TU degree is definitely valid. You may have to contact the university for it. You should also be able to get info. from American Center at Gyaneshwor. Did you do your undergrad from TU?

I did M.Sc. is zoology from TU and now doing MS in Forestry.