You have been playing for a long time; how come this problem with different pianos only happened now? Did you buy a new piano, or is the one in school new to you? Okay, here's what you do. If you can't play your current pieces on different pianos, play some easy pieces or exercises first. Something you just CAN'T do wrong. You want to get the feel of the current piano. When you feel comfortable, that's when you practice your current repertory.If Mozart is really your forte, play it. I don't recommend Raindrop although it sounds nice because it's not very impressive to judges. Liebestraum was the winning piece in the grand recital last year, you might want to try it. But neither Liszt nor Mozart is my taste.
Dun forget bout that duet piece!!! I'll die if u can't accompany me well !! jokin..
..three piano ..different kinds of toning,pedaling weight,and the keyboard weight....play is getting much worse,maybe because I practice with different kinds of piano?..... Maybe because of the piano in my house has lighter keyboards than school piano?