In Change question status-Question's visibility to student will be decided for each topic.
There will be 2 Status for a question.
By Default "Keep this topic to practice and test for student".
1.Keep this topic for practice and test for student-All Questions under this topic will be visible to student for Practice
2.Keep this topic to only test for student-All questions under this topic will not be visible to students.These questions will be visible to teacher for creating test.