Answer:
he is it
Step-by-step explanation:
The tone of this passage is anxious or worried. Merle's concern about his history exam despite having studied for days and feeling like he knew the answers to most of the questions suggests a sense of nervousness or apprehension. Additionally, the statement "He really had no reason to be concerned that he'd see the results of that preparation" implies that Merle's anxiety is unfounded, which further emphasizes the tone of worry or unease.