also... 1. One school year at Shrek Academy is 3 calendar years long. 2. One school year has 3 semesters. 3.That means one semester is one calendar year long. 4. So the 4th year/semester is the start of the 2nd school year. (that was sort of explained when he entered Shrek academy and after. with the 2nd year students being 3 years older then the first years.... it was mentioned several times throughout the story...)