As Michael watches his instructor pass out papers, he suddenly realizes this is the first major exam and he is totally unprepared. Which phase of the GAS is the he most likely experiencing?

The answer is the alarm stage.

Explanation:

The alarm stage is the first stage in the general-adaptation syndrome. During this stage, the body experiences numerous physiological changes. For example, heart-rate might increase, as well as sweating and blood-pressure. This sets what is known as the "fight or flight" response, which energises the body and prepares it to deal with the source of stress.