There are lot of reasons for a drop. My son did drop a few in the fall sometimes but by the spring he soared again.
One time they had my son take the wrong test. Another time they had him finish the next day during recess time. Also another time they had him take a map test the same day they gave him a Test of Critical thinking and also on the same day he had to set up his Science fair project. All these things made my son mad and got him off his game on test day.
Do a little checking but don't drive your self crazy. That 221 is a great score, it probably didnt happen by chance.
