My weakness in English.

My weakness in English are using a range of  vocabulary words and grammar . Firstly i do not have a good foundation in English .I usually do not use a range of vocabulary in my writing or when I am speaking. No matter whether it is in school or at home , I normally speak in Chinese or sometimes in dialect. Therefore i don't really score well in English .
In comprehension , i am unable to find the answer to the question as i don't understand the passage . And another big problem is the grammar and spelling mistake that will cause me to loss marks. The like for use of own words question , i will always write the penalty words and thus got a zero for that question .  And for inference question , i don't really can understand the hidden meaning in the question . And i am a slow reader and i cannot read the passage quickly and will be very time consuming.
For summary , i am able to find the points to the summary question  but i do not know really know how to reduce thee number of words . Like paraphrase the words , i will normally change the meaning of the words or phrase. And again is the grammar and spelling error.
For composition, i don't have fantastic story.And most importantly ,i do not use a variety of vocabulary to describe the action or event. And of course a lot of tense and spelling error could be spotted in my story. But i am not very sure how to improve my weakness.