As you sit on the MTR, you can play games or watch silly YouTube videos – even music. This will help you to relax. Another possibility is to link in to some useful lessons for English. Two I saw in a recent newsletter are:
Rachel’s English and
English with Jennifer
There are lessons on pronunciation as well as grammar. These will reinforce what you learn in class. Looking at something once is not learning it. You need to go back over vocabulary as well as key pronunciation. A little bit every day will make a huge difference.