It's just so stupid. Every time I give it a chance I end up this way: it repeatedly asks me stupid questions, I get bored, I start clicking-through it faster and faster without thinking, I make stupid mistakes while knowing right answers - for purely mechanical reasons and lack of attention, it asks me more stupid questions because of this.
I think there should be a "never show/ask me this again" button on every slide/question in every learning app. This alone can make their "AI"s a lot smarter.