Hello ahkhor97, and welcome to the forum.
How [STRIKE]to[/STRIKE] can I improve my English?
There are many things you can do. They all involve patience, persistence and practice!
You can read online newspapers in English. You can watch movies/documentaries online. You can practise writing sentences. Also, if you have the opportunity, you can practise speaking with native speakers.
Here on usingenglish.com, you're more than welcome to ask your own questions too!