Would be very helpful for refreshing/going back over old topics if the "days since last attempted" would be shown in the empty space of the hover menu (marked red in the above image). As it stands, it's very difficult to tell where you are if redoing a topic, as I have to click on the unit, and scroll down the the unit test if I want to see which was the last one I did.
P.S. I love the new layout, it's just missing this single detail to be extra practical.
for extra clarity, this is what I mean by "days since last attempted"
would also be nice to include the percentage.