I have been to Singapore, where there are many China people. As far as my experience is concerned, most people in China know Chinese (written in traditional Chinese), so you only need to have CET-4. The best way is to communicate with them bilingually, which is understandable, but you may not understand their answers.

Why do you say that? The Chinese words we use, especially the new things in recent years, may not necessarily use the same Chinese words. In this case, they may think of explaining it to you in English, and then you may encounter some difficulties.

Therefore, it is best to go abroad with a relatively high level of English.

In addition, there are many Indians working in Singapore. Sometimes even if your English reaches Band 6 or Band 8, you may not understand the Indian accent. Because they have a strong accent. But I feel fine, I don't think there is anything I can't understand, hehe! I hope it works for you!