Yes, the CHI™ practice exams (Arabic, Mandarin, Spanish) are located at this website: http://cchiinterpreters.org. You need to create a free account (if you have never used this site before).
After you login, click on the title of the practice exam to enroll, and enter this enrollment key: Study4u. Keep in mind that this is a self-assessment tool, and no review or scoring will be provided by CCHI. The user interface of the actual exam is different than this practice exam, however, we provide screenshots of the actual exam in the Logistics section.