Samples of three levels of listening test items for the CASAS Life and Work test are available at casas.org. These listening samples familiarize students with the types of items that appear on the test and enable them to practice more effectively.
Many other free resources for English listening practice are accessible online. The Hubbs Center offers listening practice items at different levels of difficulty and on various topics, such as employment and telephone communication. Elllo.org provides over 1,200 lessons and 600 videos for listening practice as well as tests to assess comprehension. Many basic and academic listening quizzes at easy, medium, difficult and very difficult levels are available at Randall's ESL Cyber Listening Lab.