Zohran Mamdani dropped his big education “plan” last week — and of course his vision amounts to nothing but bigger spending. He embraced the perverse state class-size law, which forces New York City (and no other system) to hire thousands more “educators” to no real purpose except to enrich the United Federation of Teachers. Class sizes are already below the law’s limits in nearly all the city’s (too many) failing schools; it’s the successful ones that will have to boost their teacher-student