Designing cloud-native apps requires a brutal understanding of data modeling, and the DP-420 exam definitely tests your limits. I used Killtest DP-420 exam guide to prep, and I couldn't be happier with the results. What I loved most was how the practice questions forced me to think critically about choosing between change feed processors, optimizing RU/s, and configuring multi-region distribution. The layout of the guide prepared me exceptionally well for the case studies and the tricky SDK-specific coding questions. Passed with flying colors last week! Thanks!