Always a Plant... I'm going to guess you're stuck where I was stumped a while, trying to get into the other students wing?
Spoiler:look at the fuse box closely, examine the fuses and the switch and Sam will finally be able to try a trick on the repair guy
as for the riddle based on the percentage I'm guessing it's the first few steps, if not then explain a bit more about what you've already done and we can probably help more
Spoiler:look at the poster and cheshire cat in the Alice shop if you haven't already. spell "smile" (or "smiles" I can't remember for sure) on the cats teeth. look at the postcards and head to the church
