How Often Should the Students be Tested ?
       You can give classroom tests once every few weeks -- sometimes even once a week. But even informal classroom tests,  however,  can break up learning rather than encourage it if they are set too often. This is particularly true if they are given to the class in a nervous and formal atmosphere.
     So, always try to make sure that your students don＇t feel anxious when you give them the test.
Don＇t give the impression to your students that you are making a judgment on them every time you give them a classroom test. Remember that students＇ work and abilities will not normally change greatly from week to week. For example, a student who is near the top of the class one week will not be near the bottom of the class the following week. If there is such a change, there is something wrong with the test or with the student＇s conditions.

学生多久需要考试一次?
    每隔几周，就要有一次当堂测试———有时甚至每周一次。但是，即使是不正规的课堂测验，如果太频繁的话，也只会打断学生的学习，而不会起到鼓励的作用。如果在紧张、正规的气氛下进行课堂考试，就更是如此了。
    因此，在考试时，尽量保证不要让学生感到紧张。不要让学生感觉每次的课堂测验都是你对他们的一种评价。记住：学生的学习和能力通常不是每周都会看到巨大变化的。比如，这周班里的尖子生不可能下周就变成垫底的差生。如果真的有这样的变化，不考试出了问题，就是这个学生的状态，不对头了。