thirdly， in fact， test system itself can not veraciously estimate who is better than others because there are many factors impacting the results of test. for instance， someone cheated in test so that his score would be higher than others. or someone who was too nervous to perform well fell in the test.
only in spare time and no pressure of tests existent， students can study simply for the fun， for obtaining knowledge and for the things that they are really interested in. but now the test system is the only way to select which one is better， who can reach better school and who can get good job. then what we can do is to improve the test system or hope that something better will be invented and replace the test system.