Just like unixasas said, defending is more useful than attacking. Keep throwing bombs everywhere while defending from Tuber's attacks, this way oranges will get out of your way and you can avoid things easier.
At some time, there should be a lot of oranges at the bottom platforms. Throw bombs down there through the gap in the middle of the upper platform, at least one of them should hit Tuber.
Oh, whenever a frozen orange is at the floor and Tuber's not so far from it, throw a bomb at it, it'll go straight at the sorcerer!
