Final answer:
Minerva and her schoolmates are characterized as enthusiastic, given the lively description of eager behavior and Minerva's academic drive, as well as her positive personal attributes.
Step-by-step explanation:
The author characterizes Minerva and her schoolmates as enthusiastic. The vivid descriptions of the schoolroom being turned upside down in a hustle with children skipping lessons and the chaos of their early release portray a lively and spirited atmosphere. This paints Minerva and her peers as eager and perhaps a bit reckless in their joy, indicative of youthful enthusiasm rather than being unmotivated, ambitious, or unfocused. Additionally, the endorsement of Minerva's academic prowess and character hints at a certain level of enthusiasm for her studies and personal development.