Nah, it's fine!!! I always forget things like that too. :)
It is, but I have an awesome teacher. And, in my opinion, it isn't as difficult for me, because I basically play by ear. So if I hear something, I can usually play it. Depends on how hard The song is tho.
My piano level is all over the place. I can play complicated songs, but because I didn't have many lessons for years while I played, I played the songs wrong, so now we have to start towards the beginning.