I've played Turkish March before for my piano exam.. I think /toolongago.
I don't many Canon in D is also one of my favourites. I've liked some of my past piano exam pieces (though I still hated practising cos I'm lazy as). One name I remember from the top of my head is:
Beethoven - Piano Sonata no. 8 in C Minor "Pathetique".
I only played the first and second movements (wish I was able to play up to the standard of these people back then lmao), though I think the third movement is the most recognised tune. The link I posted is only of the first movement, because first movement > second movement (second was too slowwww and boring for me). Though I really only liked the fast bits in the first movement, which starts at about the 2 minute mark in the link I posted.
I've got one I liked to play but I can't remember the name right now so I might look that up later.