Be very careful about claims of schools that miraculously “turned around” in a matter of months or even in a couple of years. The usual formula is: fire everybody, hire a new staff, and the students become brilliant.

But then Gary Rubinstein investigates, and the miracle dissolves under his careful analysis.

Here is one. Gary writes that Joel Klein in his new book boasts of the amazing turnaround that happened when he shuttered Paul Robeson High School and opened P-Tech. Only a year and a half later, President Obama praised P-Tech in his State of the Union address.

But the high school scores were released a few days ago, P-Tech was one of the city’s lowest performing schools. Gary wrote, “This could be the most un-miraculous miracle school I’ve ever investigated.”

Another school in the news is Boys and Girls High School, also in Brooklyn. The media has been demanding that it be closed down because of low test scores. But its scores are much higher than those of the celebrated P-Tech!

Gary wonders whether reformers will start demanding that P-Tech be shut down.