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For the Microsoft DP-420 exam, I would focus on understanding how to design and implement data solutions using Azure Cosmos DB rather than simply memorizing answers. Having a practical understanding of NoSQL concepts can make the preparation much easier.

Start by reviewing the exam objectives and study areas such as data modeling, partitioning, indexing, querying, consistency, security, and application development with Azure Cosmos DB. It is important to understand why a particular design or configuration is appropriate for a specific application requirement.

Microsoft Learn is a strong starting point because it provides structured learning resources and practical documentation. After completing each topic, work through Microsoft DP-420 practice questions to test your understanding and identify areas that need additional study.

I also found ExamTopicsBase useful for reviewing DP-420 questions and getting additional exam preparation practice. I would use these questions alongside official Microsoft resources so that you can verify technical details and understand the reasoning behind each answer.

If possible, get some hands-on experience with Azure Cosmos DB. Try creating containers, working with partition keys, running queries, and experimenting with indexing and consistency options. Practical exercises can help connect the concepts together and make scenario-based DP-420 questions much easier to understand.