How can you prove that you speak well English in a professional or academic context?
There is a way; do a globally recognized test. That is exactly what the IELTS does. For you to travel, study and work in any commonwealth country, this test is an absolute requirement.
That is because this universal test is accepted by all the major institutions such as the UN or EU; leading international university like Cambridge or Oxford, as well as all the big scholarship organizations like Chevening or gates millennium scholarships and others.
The IELTS is guaranteed by the British council of its quality and veracity thus it is the most valued test of English that you can do.