【please note】 This application will be terminated on March 31, 2024. In the future, we will provide a problem practice function in the "LINE Official Account" linked web application. For details, please visit the website below. https://gakken-ep.jp/extra/rankjun/ [Important notice regarding server certificate switching] Because the server certificate is scheduled to be switched, a warning "The server to which the application is connecting is uncertified." may appear when a network connection o