Whizlabs has been in the certification prep business for a long time, and it shows in both the good and the less good ways. The good is that it has built up substantial, well organised banks of practice questions across the major cloud certifications, and as the cloud providers have rolled out their AI and machine learning specific credentials, such as the AWS Certified AI Practitioner, the AWS Certified Machine Learning exams, and the Azure AI Fundamentals and AI Engineer certs, Whizlabs has kept pace with practice material for them. In my experience the single most effective way to prepare for a multiple choice cloud certification is to grind through realistic practice questions, carefully reading the explanations for everything you get wrong, and this is exactly the job Whizlabs is built to do. The questions are close enough to the real exam style to be useful, the explanations are usually decent, and the price is a fraction of official training, with the annual all access subscription being genuinely good value if you intend to sit more than one exam.
The less good is that the rest of the platform does not match the quality of the question banks. The video courses are serviceable but rarely memorable, and for actual teaching I would almost always reach for a strong Udemy instructor, the official provider documentation, or free resources before Whizlabs video content. The interface and general experience feel like they belong to an earlier era of the web, functional but a bit clunky, and every now and then you hit a question that is poorly worded or arguably wrong, which means you have to keep your critical faculties switched on rather than trusting every explanation as gospel. There is also a deeper caveat that applies to all certification cramming and is worth stating plainly, which is that a platform optimised for helping you pass an exam is not the same as one that helps you understand the subject, and it is entirely possible to score well on Whizlabs practice tests while having a shaky grasp of the underlying AI and machine learning concepts.
My recommendation, then, is to use Whizlabs for what it is genuinely good at, which is affordable, high volume practice testing to sharpen you for exam day, while getting your actual understanding from the official docs, hands on time in the console, and a proper course, and to remember that the certificate is a means to an end rather than proof that you can do the work.