While we are trying our best to keep things free with revenues from Advertising, in May 2017 when we started PDF Oral Question set download, our server load zoomed up ! With more traffic and server heavy jobs like PDF creation and large file downloads, we needed to upgrade our system. While our cost is increasing, till now, we have been coping well with our available resources. Upgrading resulted not only in better Server, but also updated Programs and faster code execution !
All this requires funds to maintain the website and provide better service, hence while we have kept the web pages free, PDF downloads are charged to cover this increased expense !