If you fail an AWS Certification exam, you forfeit exam registration fees. You will have to pay the full registration fee if you decide to retake the exam. While there is no limit on exam attempts, when you fail to pass an exam, you must wait 14 days before you are eligible to retake it. Beta exam test takers are eligible for one attempt only. Training is recommended as part of your certification preparation, but it is not mandatory for the completion of the certification. Therefore, if you need to retake an exam, you can use Udemy courses to study before retaking exams. You can plan on spending 80-120 hours practicing and studying for each AWS exam. Udemy offers a variety of AWS Certification courses. You can also use tools such as AWS exam preparation resources (which includes AWS whitepapers) and watch Amazon’s complimentary AWS Certification exam preparation webinars.