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University of Brasilia, NEPPE () has great on-line courses (used to be all in person before COVID). I do not know the rules for student visas

@dandowumn Thanks but I think it has to be inhouse at the Uni.

We don't have the tradition of ESL, or Portuguese as a Second Language in Brazil.  You might find such coursework and classrooms but I doubt you will ever get anything valuable from it.

And my experience in the US, as an emigre was not to go after these class settings.   

I went about my business enrolling in College, taking jobs, haphazardly. Back door were it warranted, changing jobs, avoiding the home country brethren, and getting myself into situations completely foreign to my habits and customs. 

It's all about your personal level of engagement with the language and environment you are dealing, IMHO. 

Language Schools are, for all I care, a waste of time and money, some racket for folks, who by and large are not even proficient at the taught language, just to  to profiteer at your expense. 

Prior to emigrating to the US, as a legal migrant, I attended some English School, which still exists on my neighborhood.  It turned out to be more a place to spend money and have a social gathering, than to actually learn anything useful.

The teachers were a couple Russian Brazilian gals who lived and held clerical jobs Stateside for a while. They were good to look at, probably  proficient in the language, but fell into the same commonplace to take you through the lame ABCs, and teach you Boring Old  Grammar, that if you know English enough, it's as useless as it can get, being English a language with more exceptions than rules. Short, simple, and sweet, everyone, even those with a "Method" used the same old tricks.

My interaction of people who attended such schools is that their command of the English language grades from non existent to get by spotty. 

Another experience I have, that might work for you, is to engage in teaching the language. That way, you take their money to learn their language.

A pitfall you are going to have to deal with is that your median Brazilian might often not have a good command of their mother  language  neither. 

So make sure to read a lot, engage socially with folks from your ilk, and take every bit of a chance to pick up new things as you go along. 

Avoid, except for the vintage classic, Brazilian Soap Operas.  You get more out of a dubbed American Series ( Think Columbo, Daniel Boone,... ). than you can get from a lame Brazilian produced soap.

In closing, if you are half as smart, you might think you are, figure things on your own and go about it. 

Ditch the experts.

Hi, I can speak Portuguese all my friends are native Portuguese speakers. my girlfriend is Brazilian, and the aim of this is more the visa and less learning the language, of course, a polish-up will always help. Thanks for your reply, everything helps when making a decision.