Yeah no that feature always bothered me too. I do so well then get up to the end and start missing some questions and then I'm no where near leveling up

thats for making u be very concetrate and consider and patiant before u ansewring and thats how u learn good

I've found that when I really get to the limits of my ears, I keep getting stuck at exactly the same points within levels (like 7/12). When I really can't seem to hear what's right at a certain point, I think it helps to go back to the point which is just within my current capabilities. That way, my ears can adjust to the increased requirements without me just feeling like I can't hear anything.
I do feel like this helps my ears to progress.
When you just get one wrong without being in that zone, it does feel frustrating though, I certainly agree with that.

@Bram Hendrix wow that actually makes a lot of sense, I think I can agree with that!