Final answer:
Chinua Achebe mentions the 'tribe' of high school students as a way to critique the portrayal of Africans in Conrad's novel and to highlight the influence of colonialism on the writing of history.
Step-by-step explanation:
In Chinua Achebe's novel, Things Fall Apart, the mention of the 'tribe' of high school students serves to highlight the influence of colonialism on the writing of history. Achebe criticizes the portrayal of Africans in Conrad's novel, Heart of Darkness, which presents Africans as having 'rudimentary' souls. By mentioning the 'tribe' of high school students, Achebe emphasizes the importance of challenging and interrogating colonial narratives in literature classrooms.