Can't do exercise on ipad?

It's been over 3 years now, and we still cannot do exercises on an ipad, is that really true?

i can't mark any lessons as studied until I've done the exercises, which I can't do since now I use the ipad for 99.5% of the time. Now I have a backlog of 40 or so lessons and it's getting pretty frustrating. 

Can someone fix this please, it feels like the site is stuck in the Stone Age...