The convenience and significance that the mobile phone brings has made it inseparable from people's lives. This research developed an APP for personal focus and time management, 'Mr. Brain', which includes a leveling mechanism commonly seen in games to incentivize users, as well as allow constructive competition with friends. This App allows the users to support each other and mitigate loneliness in times of test preparation and lets them choose their own preferred style of study, customize time use, and allows for more variety in the act of studying. It is hoped that this app can help students who are studying and preparing for exams and reduce interference from external information feed, which can help to improve focus, raise study efficiency, and add fun into the user's academic pursuit.