優(yōu)選答案10 weeks English staudy in UK can help you a lot in improving your English. Also it gives you an additional time to get used to the new life. The downsides are (1) it costs more and (2) it takes more of your time that could be used on your degree staudy. If you don't mind these two problems, then you should take the offer and start your new life in UK...Good luck.
Generally speaking, the pass rate is much higher than that if you study in China. As long as you make an effort to learn, you should pass it with reasonable confident.