Besides the other posts about simply comsuming as much English I'd like to offer my tip that helped me a lot: In England there is (/ was?) a tradition of makin

Besides the other posts about simply comsuming as much English I'd like to offer my tip that helped me a lot: In England there is (/ was?) a tradition of making middle and high school students read increasingly more difficult books throughout ages 11 - 18. There are entire book series written with this concept in mind. These are excellent to pick up. Harry Potter is a good example of this: the first Harry Potter book was written for 11/12 year olds and the books become longer and more mature with every next book. Harry Potter and the prisoner of Azkaban was the first book I've ever read in English when I was 14 or so and since then I always try to read books in English if the original is.