original: All other subjects may be sat in either Ordinary or Higher Levels.
simplifications: All other subjects may be  put in either Ordinary or Higher Levels. All other people could sit in Ordinary or Higher Levels. All other subjects may be Ordinary or Higher Levels. All other subjects may be placed in Ordinary or Higher Levels. All other subjects may be in Ordinary or Higher Levels. Other subjects can be tested in either Ordinary or Higher Levels. All other subjects may be either Ordinary or Higher Levels. All other subjects may sit in Ordinary or Higher Levels. Other subjects can be Ordinary or Higher Levels. All other subjects may be in the Normal or Higher Levels.