I am wondering any word that can describe urge for improvement.
I have learnt some of the words like, motivated, ambitious are something related to personal improvement. But it doesn't directly describe a person who urges for improvement. It merely mean he is being motivated/ambitious, therefore they definitely urge for improvement.
Best Answer
There's no one word, but here are some ways that you could describe somebody who wants to improve.
If you really want to drive the idea home, you could describe this aspiration with context: