dont know what or where to go next, im in Princess Mushroom castle past..on the 3rd floor, cant figure out whats next or how to jump up on the wall edges to get other things and boxes..Please help

can you refresh my mind tell me whats around you i cant remember that place very well.

when I first enter the castle there is a statue of princess shroob ? and I can enter others through 2 pipes, the other 2 pipes I cant find out how to access them, the first pipe all the way to the left, brings me to a level with a spaceship at the very top, im also stuck here, and the 2nd pipe brings me to the room with all the coins, then I enter the canon, but it tossess me to far. Thankyou for any help

go to the one ledge in the 3 door room and spin jump to the end and hit the block and then have the babies baby spin over to the wall and have the babies hit the red buttons and then flip the babies off your back and have hit the switch to enter the door to the boss (almost)