Online quizzes have become an increasingly popular way to test knowledge and engage students in learning. Online quiz systems have become even more prevalent with the rise of remote learning due to the COVID-19 pandemic. However, with the convenience of online quizzes comes the risk of cheating. To combat this, many online quiz systems have implemented various anti-fraud mechanisms. This article will review some of the most popular online quiz systems and their anti-fraud mechanisms. Other topics discussed include methods of statistical data analysis in the context of various statistical operations, such as fraud data; general anti-fraud mechanisms; anti-fraud features of the popular online quiz systems; pros and cons of webcam and microphone monitoring.