Quickly review important new information shortly before going to bed.
Research has shown that our brains process information that is fresh in our brains while we sleep. By shortly (this means very quickly - just a glance at what you are working on at the moment) going over some exercise, reading, etc. before you go to sleep, your brain will work away on this information while you sleep!
Other ideas on how your brain works
While doing exercises and alone at home or in your room, speak English aloud.
Connect the muscles of your face to the information in your head. Just as understanding the basics of tennis does not make you a great tennis player, understanding grammar rules does not mean you can automatically speak English well. You need to practice the act of speaking often. Speaking by yourself at home and reading the exercises you are doing will help connect your brain to your facial muscles and improve pronunciation and make your knowledge active.
Improve English Quickly
Ask yourself weekly: What do I want to learn this week?
Asking yourself this question every week will help you stop and think for a moment about what is most important to you. It is easy to focus only on the current unit, grammar exercise, etc. If you take a moment to stop and set a goal for yourself every week, you will notice the progress you are making and, in turn, become more inspired by how quickly you are learning English! You will be surprised at how this feeling of success will motivate you to learn even more English.