ProProfs is a good site for brain workout and leading provider of comprehensive online tools for building, testing and applying knowledge. It has lots of quizzes in the website, through its Quiz, Survey and Training products they offer trainers, marketers and educators great features without requiring users to download or learn expensive software.
Also they provide largest library of public quizzes and assessment tools on the Web, as well as a powerful tracking and measurement dashboard. They help its users with a valuable feedback engine to apply knowledge for increase productivity, efficiency and profitability. This great website was founded by Sameer Bhatia on the vision that knowledge should be freely available to people from all walks of life.
Join and submit your email address and register.www.proprofs.com