The test is a very effective and objective way to prove the students' results in educational process. Although the tests are the inherent part of evaluation, in practice it seems that teachers aren't well prepared for creation of test items.
Many teachers don't know that the test items creation have strict rules which must be observed. Marginalization of rules for test items creation can lead to misunderstanding, to frequent errors and students' questions.
In article there are demonstrated common mistakes in test items and main rules for the creation of different types of test items. It is summarized in several recommendations for teachers.