We try to enforce the "no mother tongue" policy, including management and teachers. We also have a "Challenger System" in which students can win prizes if they continue to speak only English. However, regardless of whether or not there is a native language policy, we always encourage our students to actively engage in English conversation with students of various nationalities. It is ridiculous to say that students cannot speak English because there is no native language policy. Since you are here to study abroad, we recommend that you try to be proactive regardless of whether the system is in place or not.