Among the schools with the SAT test takers of over 500, please list the schools that are magnet schools or offer a magnet program.
Magnet schools or offer a magnet program means that Magnet = 1
SELECT T2.School FROM satscores AS T1 INNER JOIN schools AS T2 ON T1.cds = T2.CDSCode WHERE T2.Magnet = 1 AND T1.NumTstTakr > 500