School dreams tend to surface old anxieties about being tested and measured, even years after the classroom is behind you. Showing up unprepared or lost in the hallways often points to a current situation where you feel evaluated, whether at work or in a relationship, rather than any real gap in your knowledge.
If possible, the planets must be reinforced with a fixed star from the same nature, because it concentrates the power of the influx and the duration of the work. - Picatrix (Andalusia, ~1000.AD)