Improvement: Timed practice behaviour
It is a bit annoying, that when your time is over, you are not able to see if your last answer was right or wrong.
When the time is over, you should be given the possibility to finish writing your last answer and the app should show you if it was correct before seeing the result of the timed practice.
I've noticed this, but I usually prefer to "Enter" so the system marks it wrong, and I'd be able to see what was the answer and what I intended to write. (My opinion says it's Timed Practice, when time's up, it's up!)
Or just go faster!