Most learn English for their holidays. It also takes a lot of time to get to that level, so after two years, or more, of learning English in a one evening a week class, they have had enough. The VHS, British Council and private language schools test applicants and put together classes of same ability. I have heard of classes with 25 to 30 pupils. This tends to determine the style of teaching with a lot of grammar rules, translation and writing.
Students sit in rows in the traditional way and the teacher directs from the front.
We sometimes get 16-17 year olds coming to our VHS to learn how to speak because their school English is not based on oral communication as its primary goal. My VHS does have this as a goal but we start adult beginners in a course with a course book. We have discovered our students want to have a book in their hands and we use one with all the tasks explained in German and with a large unit vocabulary section in German and English. This reduces teacher talking time in German and lets the students spend more time practising the target language in pairs or small groups rather than translating simple tasks into German before they can start the learning task. There is a lot of cassette work including repeating dialogues and pronunciation practise.