Microsoft offers a comprehensive set of resources for students preparing for exams, all of which are available for free. These resources include work materials, student subscriptions with $100, a step-by-step guide in the learning portal, video guides, and more. With these tools at your disposal, preparing for exams should not be a difficult task. It is important to stay updated with your learning portal, as the exam content is constantly changing and new materials are added regularly. The links to these resources can be found here.
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https://medium.com/@dppatabandi/how-to-prepare-for-az-900-exam-6d4c85e5423f