1.) Read newspaper in English. This is also great for improving English in a technical field. I recommended you to use DAWN, THE NEWS, DAILY NEWS newspaper for enriching your English Level. It helps a lot to learn more and more vocabulary.
2.) Watch movies when you find leisure time for this but make sure you are watching with subtitles else you are wasting of your time to see just actions. It makes you professional and learn how to speak English in front of public or audience.
3.) Learning grammar is a fundamental tool for English. This is the most important tool after learning vocabulary. Grammar gives you the style to speak in a very fine way.
4.) When you learn a little bit about English then try to speak with your companions without any hesitation to learn something new or to kick out your fear which you feel inside your brain. It helps you a lot when you are confronting with huge people. You should focus on listening. In this way, your listening power will get strong in the blink of an eye.
5.) You need to practice every day to ameliorate your English level by keeping a diary in your pocket every time. Note it down all vocabulary words with meanings, synonyms and antonyms, and at least, one sentence by using these words which you have learnt time to time.
