Stick 22 places you in the position of the scholar who has travelled far from the village to chase the examination, and finds the distance is not only geographical. The verse aches with that gap between where you are and where your heart still lives. For studies and exams, this is the stick of the student whose books are open but whose mind keeps drifting home, or back to the version of yourself that knew why this mattered in the first place. The grade is 下下 not because you will fail, but because the verse is pointing at how thinly stretched you already feel, and asking whether you have noticed.
The mirror here is uncomfortable. You have probably been treating loneliness, fatigue, and the quiet sense of being out of place as side effects to push through, when the verse is suggesting they are the actual subject. A stranger in a foreign land cannot study well by pretending the foreignness is not there. If you sat with the poem for a third read, you would likely recognise the specific evening it describes: the desk lamp on, the chapter unread, the message you drafted to someone back home and never sent. That recognition is the reading. The stick is not warning you about the exam. It is asking you to stop treating your own homesickness, in whatever form it takes, as a distraction from the work.