read english articles, newspapers, novels etc.
watch and listen to english shows and movies.
practice writing letters to your friends in english
frequently converse with your friends in english, if you have friends who are native speakers all the better
practice is the only way im afraid, there's no getting around it
The way I have practice was waching english movie with subtitle 2/3 times and without subtitle 2/3 times. That gave me a lot of confidence. In listening and speaking. For writing follow the tricks in the IELTS practice books. Helps a lot. For reading, best was I think news papers or magazines like 'National Geographic', 'Scientific American', 'Reader's Digest' etc. Best of Luck.