Thanks for feedback!
Let me rephrase your ideas and add some comments. If I get something wrong, please, correct me.
1) "guess" + sort option in the Books
I think I can easily add "guess" option and need to think about sorting.2) comparison of different tries.
Actually, the app remembers all your tries and I use color to indicate right/wrong history. For example, when you see green "right" and red line beneath that means you got it right last time and wrong time before last. I've decided not to show answers in order to avoid "visual" memory effect. Please, could you explain in detail how you see it should work3) analytic tool for OG.
I had to add this before. Definitely, I'm going to add analytical tool in next update.4) fast navigation (right numbers) is not blocked in timing mode.
I'll fix it.Thanks again! It seems I will better spend time on fixing these issues and adding new analytical tool than on app re-factoring.
Keep informing me!