It is pretty simple. Imagine you took some pictures and saved them in the cloud storage.... what would you expect happen to them in 2 years? Would you be happy if the cloud storage provider deleted them? Is that what you would expect? Is that what would make you happy - to find a clean 1GB folder with zero photos?
We save user history so that they can leverage it and continue their prep from where they left off.
We also provide an option to reset a question pool whether you have spent 2 years or 2 weeks preparing - you can
reset your question pool and mark all questions as un-attempted so that you can take them all again. We are providing flexible service beyond what some may need but also not limiting or punishing others.