What is the purpose of the various trials that Gilgamesh mus pass in order to reach utnanapishtim?

The trials that Gilgamesh must pass in order to reach Utnapishtim test his strength, courage, and determination. They serve as challenges that Gilgamesh must overcome in order to prove himself worthy of seeking immortality and gaining wisdom from Utnapishtim. Ultimately, these trials help Gilgamesh grow and develop as a character throughout his journey.