I am a university student

I am a university student from Singapore. Free saver has drastically reduced the number of papers used for jotting down of notes and practicing of mathematical questions. The app enables me to better arrange my notes according to the different modules for future referencing without having the need to search for my notes each time.
A suggestion to better enhance the use the of this notebook could be an addition of a special type of cloth to erase the contents without the use of water. However, on a whole, I feel that it is an economical and environmentally friendly stationary item that every university student should have.