This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
It's not very easy to say. I would suggest reading books in english in the first place. Nothing really education-oriented, just whatever you like. It should make your vocabulary better. Then, watching series or dramas in english (possibly with english as well). The last thing is to find yourself someone you can talk to, native person would be the best as she/he might help you with your accent ;) 

Hope it helps!
3 3 3
Make a dairy write what you have done today and then check it with someone who speaks English well. It will improve grammatical mistakes and you can speak English fluently.