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The difference you experienced between the practice assessments and the actual MB-800 exam is not uncommon. Practice Assessments are designed to provide an overview of the style, wording, and difficulty of the questions you might encounter on the actual exam, but they are not identical to the exam content. They serve as a tool to help you gauge your knowledge and identify areas where you may need further preparation.
While Practice Assessments can be helpful, they are not a replacement for comprehensive training or hands-on experience with Microsoft products. Some exams may have additional resources available, such as practice tests offered through MeasureUp, which might provide a more in-depth preparation experience. However, not all exams have the same level of practice material available.
If you found the actual exam to be significantly more challenging, it may be beneficial to seek out additional study materials or resources, such as study guides or videos from Microsoft Press, to enhance your preparation for future exams.