Hi Roberto. I just want to give you a tip. Actually learning together with a non-native speaker is a great experience too. There are a lot of B2-C1 level English learners in this program, so you can find them more easily. Native speakers are harder to find tbh. Moreover, you can fully practice your target language (English) in a whole calling-session, rather than have to split it into half. It's just my opinion and my suggestion for you. Hopefully you can improve your English. Good luck brother :)