As an international student applying to an English-speaking university you will have to prove that you have a good grasp of the English language. In most cases this can be done through taking an exam called the Academic IELTS, which tests the strength of your English listening, speaking, reading and writing skills.
It might seem like a lot to take on, but having this under your belt will not only consolidate your English-speaking skills (which will be a great help when you are at university) but will open doors to which country you can study in.