* Socialization and networking: Even an omniscient being might benefit from interacting with others, learning about different perspectives, and building relationships. School provides a structured environment for this.
* Experience and application: Knowing everything theoretically is different from experiencing it firsthand. School offers practical application of knowledge, experimentation, and collaboration on projects.
* Exploration of new perspectives: While you know everything, new perspectives and approaches might emerge. School could facilitate a different understanding or a novel synthesis of existing knowledge.
* Mentorship and teaching: You could attend school to mentor others, sharing your knowledge and guiding the next generation. Teaching often reinforces one's own understanding.
* Hidden knowledge or undiscovered truths: Even with complete knowledge, there might be subtle nuances or undiscovered truths that could only be revealed through investigation or interaction within the school environment.
* Pure enjoyment of learning: The process of learning itself could be enjoyable, regardless of the acquisition of new factual information. The challenge and mental stimulation might be the goal.
In short, if you knew everything, school would be a choice, not a necessity. The reason for attending would be driven by personal enrichment, social interaction, or a desire to contribute to the learning environment rather than a need to gain knowledge.