hello,we are both Chinese right?i think it's a little bit hard for you because the vocabulary you gonna use is offical right?how about learning business English in the cram school?and this is my Skype ID:linkinrider

The most effective way to improve (in anything!) is to approach it from a well-rounded perspective and to set specific goals. This means that you should practice reading, writing, listening, and speaking. And you should choose a goal with a deadline for learning something specific. It could be a very short timeline (such as "learn 20 new vocabulary words this afternoon") or it could be a little bit longer. I suggest monthly goals that you can break down into weekly or daily tasks. For example, you might say that you want to be able to have a friendly dinner conversation with a client. Think about what you might talk to a stranger about over dinner and focus your learning on those ideas. (This might be small talk like recent movies, hobbies, family information. Or if you need to have more business-focused discussion, then you should make sure that you study those terms.) Having a language partner who will have basic conversation with you is very valuable for practicing speaking and listening.

Hello Cathy, Improving your English quickly will mean a lot of practice, but it should be focused on the vocabulary you need at the beginning. Typically, you would find a business English teacher who has experience of sales terminology, and a good understanding of international trade. You will also need a textbook with English vocabulary to study. Your teacher will help you with reading, writing, listening, and speaking, and for your needs, this should be intensive for a few weeks. Best wishes, Andi