This is the 10605th most frequent Polish word.
dokona
"Dokona" means "will accomplish" or "will complete" (third-person singular form of "dokonać").
Here, 'dokona' is used in its primary meaning, indicating that the subject (the student) will complete an act of choosing.
Student dokona wyboru przedmiotu.
The student will make a choice of subject.
In this context, 'dokonał' (past tense of 'dokona') illustrates the successful completion of significant actions historically.
Człowiek dokonał wielkich rzeczy w historii ludzkości.
Humankind has achieved great things in human history.
This usage of 'dokona' emphasizes the finalizing of a meticulous process or activity.