The cuckoo of this verse cries until blood mixes with its tears, a bird that once was a king and now wakes far from anything it recognises. That image is doing the work here. The stick is reflecting back a quieter version of that same displacement: the textbook that used to make sense and now reads like a foreign language, the lecture hall where everyone else seems to nod at the right moments, the quiet panic of feeling like you wandered into the wrong life and forgot the way back.
This is a heavy stick, and the heaviness is the point. The verse is not warning you about a future failure; it is naming a homesickness you are already carrying. Maybe it is literal, you are studying away from family. Maybe it is internal, the subject you chose has stopped feeling like yours, or the version of you who picked this path feels like a stranger now. The cuckoo's cry of bu-ru-gui-qu, better to go home, is not necessarily telling you to quit. It is asking what home means here. Your roots, your reasons, the people who knew you before the grades did. Drawing this stick during a study question often means the exhaustion has outgrown the goal, and pretending otherwise is what is draining you.