For the second straight year, six area schools placed among the nation’s top 1,500 high schools in an annual survey conducted by Newsweek magazine. James River High School in Chesterfield County was the area’s top-rated school, coming in at 246. Last year, it topped the area list at 210. The schools were ranked based on a formula that combines the number of Advanced Placement, International Baccalaureate and Cambridge tests and divides that by the number of graduating seniors.