AFAIK there are no practice exams. The training path for the exam is following the ServiceDesk bootcamp 5-day training. If you go to 'training' here on the community you can see the current schedule.
It is possible to pass the exam after sitting the boot camp (I managed it. Just!) but it certainly isn't easy as many of the questions are around design within the system. It sets you up well for a system you have but there is no substitute really for having hands on with a system so that you can use that knowledge in the exam.
MarXtar Ltd/MarXtar Corporation
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Thanks! Frank and Mark.