my oldest difficult child will test with an iq well below the mentally retarded lowest threshold but is taking calculus and passing with a B
my oldest fem. difficult child: went from a 52 to a 120 after I taught her appropriate reading skills
youngest male difficult child test higer than oldest difficult child on Iq scales but gets F's....
youngest Fem: tests extremely high on test (gate program qual'd); but performs below ability--above her grade but below ability because siblings shun her if she does better--a major problem as she passes those that chose not to perfom academically...
IQ scores can fall due to a student not getting appropriate intervention. When appropriate intervention is not forthcoming, learning can stagnate resulting in no growth.
Proper identification of problems followed by appropriate intervention are key.