How I study English

I am poor at English so I study English hard before I go to New Zealand. First of all, I have to study grammar of English again. When I was a high school student, I did not like grammar of English so I didn't study grammar of English hard. Next, I have to learn words as many as possible because I forget a lot of words of English. Finally, I have to try to speak native speaker. I want to speak English well.(84words)