Practice makes perfect. 熟能生巧。
A:I am absolutely certain I'm going to fail my English test.
B:What makes you so sure and why are you so pessimistic?
A:Because it is impossible to improve listening level within a week.I'm not being pessimistic.I'm being realistic.
B:This is your only reason?
A:Yes,I know my vocabulary and reading comprehension are pretty good.But my listening hasn't changed at all in a long time.It seems so hard to improve it,and I'm not exactly sure why.
B:Don't worry about it.Practice makes perfect.I'll lend you some listening materials so that you can practice more before the exam.I believe you can pass the exam with good preparation.
A:Thank you.That's very nice of you.