Her teacher there was favoritism in the score may be because he has a bias towards Asian people. He thought that a man would never have Asian English language ability equivalent to the American people.
Her teacher bias in scoring. Maybe it's because he has a prejudice against Asian people. He thought that Asia would not be the English equivalent of the American people.
Your teacher has a bias in the scoring. Maybe it"s because he"s bias to Asia. He thought the Asian people have no English language ability of the American people.