Effective teachers, lackluster test scores?

Susannah Newsmith:

Two big evaluations of education in the Sunshine State came out this week–and readers can be excused for feeling a bit confused, because they tell rather different stories about the state of Florida’s schools.
Eleven newspapers around the state went front-page this week with stories highlighting the release of teacher evaluation data. The vast majority of Florida teachers–98 percent–were rated “effective” or “highly effective.”
Meanwhile, two papers–the Lakeland Ledger (which ran wire copy) and The Palm Beach Post (subscription-only) gave A1 placement to stories about Florida’s results on the Program for International Student Assessment, which tests students in more than 60 countries. (Florida was one of three US states to pay for state-specific results.) The numbers weren’t sparkling: Florida kids fared roughly in line with the US and international averages in reading, and similar to the lackluster US average but well below the international standard in science. In math, the state’s results were worst of all: well below the US average and “similar to Croatia,” as the Post story put it, with 30 percent of students scoring as “low achievers.”
The demographic challenges in Florida’s schools are real, but still there’s an obvious question here: How can the state’s teachers be doing such a great job while students can’t compete with international peers and struggle to keep up with already-middling US scores?