Higher Education (Side Quest)
This quest becomes available immediately after completing 'The Accidental Philosopher' quest in Alexandria
Return to the docks to speak to Tefibi and his mother again.
You'll need to head out on the water for this one, but there should be boats available here, particularly to the southwest.
Once aboard, head for the marker, and then use Senu to ID the ship. It's a small boat, not a full trireme.
Bayek mentions getting aboard unseen, but two headshots seems like a more efficient solution to the problem.
Confirm your kill to retrieve the papyrus, then head back to land. You can even take the thieves' boat, if you like.
Speak to his mother one more time to complete the mission.