Practice is the answer. Practice, practice, practice. There is no "fast track" in getting a good band.
A few tips that may be useful:
1) Read english newspapers. To be familiar with how words flow in formal sentences. How graphs and tables are described etc. Write down words that you do not understand and then look them up in the dictionary.
2) Watch english TV shows/movies. Try to get a hold of DVDs of english shows/movies so you can read the subtitles; then next time try to watch without the subtitles. I highly recommend cheesy popcorn while doing this exercise

3) Spend a lot of time conversing with friends whose native language is english. The more varied the accents the better.
4) If you do not have the patience to read whole novels, then I highly recommend for you to try to read books like "Chicken Soup for the Soul" for starters. The book contains several short stories that you can read and finish sometimes in one sitting. Just get yourself reading!
congratulations to sifarsen for achieving a very good score!