Lots of practice and with different types of literature. That's why the students who tend to read more have less trouble with the english portion. You can do a lot of contents reading, meaning even though you do not know what a particular word means, but you can read around that word and figure out the meaning of the sentence. That's really helpful when you are taking the test because lots of time the question will be asking you to figure out the meaning of a vocabulary by reading the passage.