If you're serious this is Perfect

The courses offered with i-to-i are amazing, I had the honor of taking the IELTs coach, Young learners, teenage learners and the main 160 hour +20 in class hour courses. These courses go in-depth in the areas you will you need to know and practice when going out to teach English internationally. The grammar lessons proved very practical, the extra material offered to buy also helped out greatly(teaching guides). You can't just choose the course and think you can rush finish it. Its gonna take time, and the amount of time you invest into it, will be well worth it in the end. Taking notes through the course, I look back and there was never a chapter that did not have information needed. The safe are also very helpful in and throughout the course, trying to help boost your confidence and guide you on the right path. I greatly encourage you to try it. On the plus side, it is a lot cheaper and I believe more fun then the oxford courses.