I have studied English since I was middle school student
But I am not sure why I need to study it
After being student in my life and I had to look for a job and
I didn't need English at that time
But to promote in the company ,I realized it is very essential to be able to speak English
I would like to be a good English speaker
And please give me a good tips to improve English
Help me.

Correctionn:

 I have been studying English since I was middle school student.But I am not sure why I need to study English.After my student ife I had to look for job and I don't need to speak English at that time.But in order to be promoted in a company,I realize that it is essential if you were able to speak in English. I would like to be a good  English speaker.And please give me good tips to improve my English. Help me.

Answer to your question:

Hello River. Thank you for letting me know  why you wanted to study in English. I advice you to read English books more  often and also always make a good conversation using the language.