STEP 4 - ATTEND classes regularly.

If you really want to improve your English QUICKLY, you need to take a lesson or two everyday. If you have a busy life, and want to maintain your present level of English until you can find time to study more intensley, then attending a lesson once every two weeks might be enough. The important thing is that you think about your goals and how serious you are and decide how often you should attend a lesson, THEN you should attend classes as often as you first planned.
It's important to take notes during class. The teacher might introduce 30 new words in a lesson and you write down the 10 which you don't know or use so that you can remember and use them. In other lesson, there might be a lot of discussion and you might write down 4 or 5 sentences which you usually say incorrectly or don't know how to say.
You should challenge yourself each lesson to write down GOOD notes. This will make your lessons even more interesting for you and be useful for later review.