British pronunciation is very demanding. If you can master it skillfully, it will be noble and pure that American accent can't reach. But if the pronunciation is not pure enough, it will be neither fish nor fowl. Compared with British pronunciation, American pronunciation has made some changes to make it easier. Moreover, since most textbooks and most radio and TV programs are American pronunciation, I suggest you choose American pronunciation. If you live in an English sound environment or have great interest and confidence in English sound, you can also choose English sound.

As for learning methods. If you want to improve your English listening, I suggest you watch movies, such as Friends or some movies you are interested in. Be careful not to look at the subtitles. It may be difficult at first, but because there are images, it should be helpful for understanding. If you want to take the exam, you can do more listening exercises every day and persevere. As for oral English, I suggest that you can imitate your own listening materials and memorize common conversations. At the same time, I also hope that I can participate in the English corner and seize the opportunity to talk with real people.

I hope the above can help you.