Dear Moon Unit,
You have taken the right approach by reviewing the articles with your student. You’re absolutely right, he does need to practise using them in daily life. You could suggest to your student that he asks people to correct him when he makes mistakes with articles. I’m sure his friends will be happy to do that for him. It’s also a good idea for you to be tough on him when he makes this type of mistake in class: don’t let a single error in the use of articles go uncorrected! The best way to do this (as I’m sure you’re already aware) is to indicate that a mistake has been made and ask him to correct it.
You can also suggest that he pays particular attention to the use of articles in newspapers, magazines, songs (any form of written or spoken English); encourage him to choose two or three examples of articles whenever you do a listening or reading activity and to explain the use of that article. This is something he can do in his daily life too.