My poor English

In the second oral English examination I failed again, because I couldn't understand the teacher's questions at times. What should I do? Come on!

I agree with XiaoHei, first check if the teacher's own accent is the problem. English teachers should all speak clearly, though that isn't always the case in reality (I actually drop my Aussie accent entirely when teaching).

Most of your listening comprehension comes from recognition, so watch movies and listen to the words in English songs. Get familiar with the patterns, and you'll find it easier to process new information as you hear it.

Listen for keywords (good news: in English speech all the vital information receives the stressed accents) and also listen for any negatives: no, not, haven't, don't, etc.  In the listening exercises I do with students, these negatives are usually thrown in, and sometimes the correct answer isn't stated clearly, but only implied.

My poor English

I failed again in the second spoken english examination.
Because I coudn't understood the teacher's questions sometimes.
Come on! What should i do?

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1. What Xiao He suggested above.

2. You can read out loud dialogues written by native speakers.
Listen to how your own voice is different from a native speaker's.

3. Practice with a friend. :D

4. Tell the teacher to slow down.

Firstly, what is the nationality of that teacher? If he is non-Chinese, then you should be worried about understanding his accent. I wouldn't blame you completely because I myself have problems understanding British and Australian accents.

Anyway, you can enhance your listening skills by watching movies.