We have two cosmic teachers in our Solar System: Saturn the Drill Instructor, and Jupiter the College Professor.
Saturn is a demanding, yet structured energy that can feel like an indefatigable proctor sometimes. You feel like your study materials are insufficient. You may feel like the grading isn't fair. You feel like the lessons are never going to end -- but eventually, they do, and then Saturn unceremoniously moves on to another area of your life that needs crystallization or clarification.