Speaking English

I have done my English speaking exam. It was awful. I was supposed to choose one topic for speaking and tell a teacher my idea about the topic (Try to be consistent on the verb tenses. ...to choose one topic for speaking and tell... The verbs being used here are in a same event) . I was too nervous and got confused. Unless my ideas and sentences are organized in my head, I'll never talk correctly. I don't know why. I was just murmuring senseless ideas even not grammatically correct ("grammatically" is an adverb. Add something it'll modify).

I'm very talkative in speaking Korean and (You can just use "and" to connect two independent clause instead.) I also love to discuss specific topics and make it deeper. I want the same experience with it in speaking English. How do I become confident?

Your writing ability seems to be good so you can be confident about that. For some people, exams can really make them nervous so it would be natural to panic during exams? I think that as long as you can speak English with ease to others casually, you will have less problems on your next speaking exams.The more you speak of it, the less you'll worry about your mistakes. And let's say you'll still fail the exam (and you really needed to pass the exam to have better work opportunity), at least you have no problems speaking in English casually (since the point of speaking exams is to measure how fluent and easy for you to speak in English where it can be understood). So how to become confident? In my opinion, that depends on how much you can accept failure.

Your English is good! Keep up the good work~