有沒有人可以幫我改一改文法&改通順一點??(英文好的請進)

I think what you mean is this:
I always try to listen and ask more questions until I finally understand the subject.
The way you wrote is a little too clusy and long and there must be something added after understand to get the sentence complete.

I have to listen , ask question, and learn more until i understand .

Don't make it too hard, you will confused yourself.

I am eager to learn, keen to raise relevant questions and analysing what I heard so that I understand more

I listen and ask questions until I gain a solid understanding of [xxxxxxx].