Simple pricing
Start free, with no card required, and upgrade whenever you want more practice per day.
The range is there because bigger source material costs more to turn into a question, so a deck of pasted notes lands at the top of it and a full past paper with its mark scheme near the bottom. Across the decks in our public library, Pro works out at around 569 questions a month. That assumes you work through a deck, since starting a new one also prepares its next question in advance so that it appears instantly.