A few weeks ago I passed the AWS Certified Developer Associate exam.
Overall Score: 88%
Topic Level Scoring:
1.0 AWS Fundamentals: 100%
2.0 Designing and Developing: 80%
3.0 Deployment and Security: 87%
4.0 Debugging: 100%
I used the ACloudGuru videos + the official documentation and videos from re:invent, together with Whizlabs test exams.
Whizlabs's exams are not only realistic and comprehensive, but also help you understand what mistakes you've made with clear explanations and resources.