The tests and quizzes tool in Sakai allows instructors to create and administer online tests, exams, quizzes, and surveys. Instructors can control the delivery, grading, and feedback options of the tests, and the test contents can be saved in a question bank to be used for future use in other tests. Entire tests can also be saved and imported to other courses.
Also see Tests & Quizzes Tips and Tricks
Creating a Test with Sakai's Tests & Quizzes Tool
Or Click here for detailed instruction at the Sakai website