I strongly disagree with some opinion that Portuguese is not a difficult language because it is even for natives. For you to study in here is necessary acknowledgement in our language depending upon what you wish to do. If you intend going to some university, our courses are developed under Portuguese language; if you intend to enter high school I believe there are schools that provide it in another language (you can make a research in order to confirm this); and if you desire attending a Portuguese course, you should come with a basic comprehension of the idiom. Good luck.

If you want to do a graduation, yes... you have to speak English. There are some Portuguese courses for foreigners: http://br.cellep.com/curso-de-portugues-para-estrangeiros/ http://www.alumni.org.br/portEstrang.htm Or you can do a exchange: http://www.pucsp.br/arii/portugues_estrangeiros.html

yes, because to speak Portuguese in Brazil to very complicated, thousands of natives have difficulties with their own language.

Yes, you not need to have full command of the language, but the basic. Good luck!

Precisa saber português, mas eu acho que com o português que você sabe não seria dificíl de estudar no Brasil, até porque você não erra quase nada na escrita só não sei como seria a sua comunicação e se nos entenderia falando.