Certificates

Willing to take the IELTS examination? So check the dates on the British Council page (if you live in Brazil) or the IELTS international/official page is you live anywhere else!
But if you don't even know what the IELS is, I'll give you a hand: The IELTS is an internationally recognised certificate, which is good for:

- proving one's English skills

- allowing students to join certain universities in the US, UK, Australia, Canada, etc.

- allowing students to obtain a visa by Australian, NZ and Canadian governments.

Other important certificates for learners of English around the globe are the Cambridge, the TOEIC (Business English) and the TOEFL, for which you can practise here.

In the ETS page you can find a whole lot more of information concerning these tests, amongst others.

Listening resources

I've previously discussed about the importance of pronunciation when teaching/learning a language, and now it's time to provide you with some resources to practise listening - which, for sure, helps improving one's pronunciation once they've internalized the sounds of English language. What I'll provide here:

If you're a student: great resources for "studying Listening" systematically.

If you're a teacher: great resources for preparing amazing classes, especially if your student is going abroad and needs guidance and practise in topics such as: immigration/customs, airport talk, restaurant conversations, etc.

This is the page where you can find it all, for all levels! Another great page is the famous ELLLO, in which you can find great listening exercises (covering many kinds of accents) and games. You might also try this page, which brings "comprehension quizzes for listening skill improvement for beginner, intermediate and advanced ESL EFL English levels".
Off you go!