first of all, the vocabulary is very important . you can enlarge it by reading , by reciting. you enlarge it like the social circle , that is to say, you don't have to know all the meaning that the word has, but you can just know how it is used the most frequently .
secondly , it's the grammary. many people think it thanlast important in Learning a new language . but i think it very useful when you are concerned to writing something. it help you to avoid the wrong expression .
last , to speak to yourself all the time in english is a good way , goooooooooooood way to improve the oral english 、
thanks for reading