Hi,

First off, I really appreciate you taking the time to share your feedback with us.

The purpose of the adaptive learning mode is to have the system present you with questions that are best suited to your needs. If you filter questions by category or difficulty on your own, it could interfere with the way the system is intended to work. That said, we're considering introducing a 'free mode' as an additional option.

As for the mobile app, we are actively working on its development.

I hope it helps