This is a helpful resource, but I encounter multiple questions on each of the practice exams in which I either actively disagree with the author’s chosen architecture for the solution, or in which I don’t think the questions really give enough context to arrive at the chosen answer.
For example, in one question, the author specifies using CloudFront as an “FTP website”. In another, an answer is chose purely based on cost optimization, when cost optimization is not mentioned once while framing the question. In one instance, he mentions a feature of the CDK utilizing “manifests” for application feature flags.
I also find the response times to be too slow in the forums when I’ve had an issue with a question.