It is said that the B2 exam is as difficult as the 44 exam in Telford, but my own feeling is that, after all, the requirements for oral examination and writing are much lower and easier than those in Telford. The oral English is paired with another candidate, and the preparation time for both questions is about ten minutes. Then ask two people to face two examiners. Answer basically according to the requirements of the topic. There will be a simple self-introduction before, just a few words. I think the advantage of talking to the teacher is that the teacher will listen to you, and you won't be able to talk when you take the Telford computer test. Oral English is below 15, and if the total score is over, you will fail. Two groups of topics can be found in Goethe official website. I also have a phone number, 02 1-62897762, which is the registration for examination and training.
I didn't know anything about the pre-test training class afterwards. It won't help you at all, but good luck!