To learn quickly you need to immerse yourself in English. Short of living in the US or another English-speaking country, you should find a language partner and talk to them every day for a long as possible each time. Italki has a place where you can search for language partners. From your question, I would guess you already know the basics of English. You can improve by doing exercises from a book, but you still need to speak regularly. Speaking a new language is the hardest skill to learn and takes a lot of practice. Good luck.

you must practice every day

skype name: haris19922 .. looking forward to see you..