Answer:
illogical reasoning
Explanation:
Illogical reasoning is defined as reasoning and comprehension based on logic strategies or plans that are not well-founded or valid at all. Usually, the error in logic is determined from a domain that is different from the participant or subject at hand. In other words, illogical means not capable of clear or characterized, sound reasoning.
In the given example, the degree of preparation doesn't determine how well the person is going to perform in the exam. Hence, she is making illogical reasoning.
