No, it is not mandatory to know French or German language to study in Switzerland. Many universities in Switzerland have programs taught in English, mostly for graduate students. Still, it's a good idea to learn French, German, or Italian for living, internships, and jobs. Some bachelor's degrees might want you to know a bit of a national language. To get into English programs, you may need to pass an English test like IELTS or TOEFL. If you know the local language, it can also help you get part-time work and find a job after you graduate in Switzerland.