What is "overprepared"

Usage examples of "overprepared".

They would begin innocently enough with some fragment of the distant past, her mother’s face–or with the immediate past, some boy she’d met that very day, or a classroom lecture she’d not been prepared for, or been overprepared for–and then they’d segué into the dark corridors of an endless building, a vague goal to be achieved if only she could find her way through the maze, the sense that her friends were with her but that she was utterly alone, that it made no difference whether or not she found what she needed but that if she didn’t she would die–and then the colored lights came wheeling in, gently, from the edges, and the riot of smells overcame her.

He was going to feel rather embarrassed if nothing happened… but it was better to be overprepared than under.

They would begin innocently enough with some fragment of the distant past, her mother’s face—or with the immediate past, some boy she’d met that very day, or a classroom lecture she’d not been prepared for, or been overprepared for—and then they’d segue´ into the dark corridors of an endless building, a vague goal to be achieved if only she could find her way through the maze, the sense that her friends were with her but that she was utterly alone, that it made no difference whether or not she found what she needed but that if she didn’t she would die—and then the colored lights came wheeling in, gently, from the edges, and the riot of smells overcame her.

Doesn't mean I'm right, but consider the consequences of being underprepared, rather than overprepared.