Teachers are those who inspire you to keep you motivated. The teacher shows you the important method that you have to do it, practice it. Some methods teachers can teach you are as follows:
- Watch entertainment TV channels, movies, music, reality TV shows, videos on youtube...
-Read English books/newspapers
-Write vocabulary words on labels and stick them on items that you use most often in the house.
-Make a note of new vocabulary
-Find your own English learning environment, English learning friends around the world to improve your communication skills
-Choose the best time to study
-Listen to British and American music
-Language exchange to improve English communication
-Practice conversational English whenever you can
-Recording lessons
-A good bilingual dictionary is required
-Learn English idioms and phrasal verbs
-Write every day
-Ask your teacher to teach English in the way you think is most effective.
And many more tips. Teachers are just guides, it's up to you whether you try or not.

@quachthienan2007150