提高中文水平

Could you please correct.

你知道,我仍然有我的发音问题仍然有些问题。我忘记了很多单词。（I'd suggest you to put it this way - I cannot always remember all the words. 我常常记不住单词。 Because you used "forget", and that is a simple tense. If you use 了 after the verb, it means that this action has already been done.）
我认为，为了提高我的水平中文，我一定要多讲。
所以(You didn't really use words like "therefore, thus" in your sentence, besides, we don't really use 所以 to start a line, so it's better not to say it like this. However, the logic is right and the sentence does make sense. )我准备了一些问题, 因此这样我就可以练习我的口语和理解.

You know that I still have problems with my pronunciation; I forget a lot of words.
I think that in order to improve my Chinese, I must speak more.
I prepared some questions, so I can practice speaking and understanding Chinese.

提高中文水平

Could you please correct.

你知道,我仍然存在发音问题。我忘记了很多单词。
我认为，为了提高我的中文水平，我一定要多讲。
所以我准备了一些问题.
以便我可以练习我的口语和  提高理解能力. 

 i hope that can help  you.

提高中文水平

Could you please correct.

(In this part, we don't need to translate you know),我仍然有我的发音问题。我忘记了很多单词。

我认为，为了提高我的中文水平，我一定要多讲。

所以我准备了一些问题来因此我可以练习我的口语和理解.

You know that I still have problems with my pronunciation; I forget a lot of words.
I think that in order to improve my Chinese, I must speak more.
I prepared some questions, so I can practice speaking and understanding Chinese.

提高中文水平

Could you please correct.

你知道,我仍然有我的发音问题。我忘记了很多单词。
我认为，为了提高我的水平中文中文水平，我一定要多讲。
所以我准备了一些问题.
因此我可以练习我的口语和理解了解中文的意思.

You know that I still have problems with my pronunciation; I forget a lot of words.
I think that in order to improve my Chinese, I must speak more.
I prepared some questions, so I can practice speaking and understanding Chinese.