 While, with the exception of a few, IB courses can only be taken by students a part of the IB program, many students take AP classes as Midlothian High School excels as one of the top high schools in the nation.MHS uses a 10-point grading scale for all classes as of the 2014-2015 school year.The International Baccalaureate (IB) Program has been a specialty center at Midlothian High School since 2001.