Upper Intermediate is when you already know enough English to feel comfortable abroad in everyday life. Upper Intermediate, or threshold advanced level, is the stage at which a person is almost fluent in English. He can easily support any everyday conversation, discuss the news, express his opinion about a book or a movie. At the same time, there will be almost no mistakes in speech. With this level, a person will be able to live permanently in an English-speaking country, work and study at a foreign university. To understand your level, it is worth checking each of the key English skills. You can definitely do this using a test, but not the first one you find on the Internet. It's better to let it be a school system that you trust. For example, in Mango English, you can take the test here
www.mangoengl.com/test