This Seether album is titled "Isolate and Medicate", which is what more than a few people use the answer to the first riddle to do. The album is necessary to my magical music experience because having music playing in the background is an essential study method! Studies have shown (I believe) that listening to music in the background while studying actually forces you to concentrate more effectively on the material being studied and you do better. :)
I can use the answer to the second riddle to both dominate the Quidditch field AND to clean the floor of my room, and this Tide laundry detergent will clean both my Quidditch AND school robes good as new and make them smell great too!
These hanging corner shelves are an excellent way to organize and display my school uniform witches' hat and my roaring lion hat that Luna Lovegood occasionally borrows from my when cheering at the Quidditch teams!
This amazing chair is a very tasteful and comfortable place from which to read/study from all of my school books!
This Pirate's Booty tasty snack can be hidden/stored in the answer to the fifth riddle, and it would make an awesome study snack!
This costume, which includes the answer to the bonus riddle, would be helpful for hiding my identity from Mr. Filch while being out of bed in the middle of the night and up to no good, although a tad small for me!

Mischief Managed

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Reddit mentions of Pirates Booty Aged Cheddar, White, 14 Ounce