I'm a beginner in English, and I

wanna improve my English.

My phraseing is not very authentic， Iand I would appreciated it if you could correct my mistakes.

Hello，I'm from China.

You should introduce your name

I a’m a senior high school studentenior preparing for themy college entrance examination next year.

We usually contract “I am” into “I’m”, it sounds more natural. You don’t need to say “student” because “senior” already implies that you’re a student. Although it isn’t “your” exam, It sounds more natural to say “my”.

wannaI would like to/ want to improve my English

“Wanna” is very casual. You also always need a subject in English. So it would be “I wanna” not just “wanna”

My phrase is not very authentic， Isentences are not very natural, so I would appreciated it if you could/ would correct my mistakes.

“Phrases” aren’t the correct term, “sentences” are better for this context. Authentic is being used incorrectly, what you’re trying to say which is natural (自然). “I would appreciate it if you would/ could…” These are phrases that are used to show your gratitude for something that hasn’t happened yet. “Mistake” should be made plural, as it isn’t just one mistake.

Feel free to talk to me，, and let's be friends！！

I wannat to improve my English

'wanna' is casual, mostly spoken English

My phraseing is not very authentic， I, so I would appreciated it if you corrected my mistakes.

Feel free to talk to me，and l! Let's be friends！！!