THE COMPARISON BETWEEN THE SECOND MID-TERM ENGLISH TESTS FOR THE SEVENTH GRADERSMADE BY THE STATE AND PRIVATE SCHOOL CERTIFIED ENGLISH TEACHERS (The case of test items analysis of SMP N 1 Semarang and SMP Kesatrian 2 Semarang in the academic year of 2013) (Jurusan IKM FIK UNNES, 2015)