The story
Last term I failed my English exam.
I was surprised, because I studied every evening.
I read the textbook again and again.
I knew the grammar rules very well.
But in the listening part I understood almost nothing.
My teacher looked at my paper and said one thing.
"You are studying English. You are not using it."
That evening I did not open the textbook.
Instead I watched a short video and listened to a song.
I did this every day for three months.
In the next exam my listening score was almost twice as high.