Take responsibility

It's easy to expect your teacher to teach you English, but that's not how language acquisition works.  The teacher is there to present English to you, but you have to learn it.

After all, you wouldn't expect a waiter to eat your dinner for you, or a barman to drink your beer for you.

I was always very clear with my students.  In the first lesson I would tell them I wasn't there to teach them English, I was there to help them learn it.  There is a difference.  So, once you've been presented with new English words or vocabulary, it's up to you to use it, review it, even play with it.  It's the only way you'll get it to stick in your brain and start to make sense.