The fault lies with the teacher, not the students. Designing an exam that can be so trivially gamed to get 100% is irresponsible. You cannot blame the student

The fault lies with the teacher, not the students. Designing an exam that can be so trivially gamed to get 100% is irresponsible. You cannot blame the students for taking the optimal sequence of actions to maximize their chances of a perfect grade while minimizing their chances of a bad grade.