Juvenile Sci-Fi/Fantasy

I've read all these books.
(Except some of the Diana Wynne Jones ones.)

• The Book of Three
  (Chronicles of Prydain 1)
• The Black Cauldron
  (Chronicles of Prydain 2)
• The Castle of Llyr
  (Chronicles of Prydain 3)
• Taran Wanderer
  (Chronicles of Prydain 4)
• The High King
  (Chronicles of Prydain 5)
• The Foundling and Other Tales of Prydain (Prydain)

• The Farthest Away Mountain
• The Indian in the Cupboard
  (Indian in the Cupboard 1)
• The Return of the Indian
  (Indian in the Cupboard 2)
• The Secret of the Indian
  (Indian in the Cupboard 3)
• The Mystery of the Cupboard
  (Indian in the Cupboard 4)

• All the Money in the World

• Do-it-yourself Magic
• Earthstar Magic
• The Enchanted Book
• The Hidden Cave
• Last Chance for Magic
• Magic of the Black Mirror
• The Magic Coin
• Magic in the Park
• Mostly Magic
• No Such Thing As a Witch
• Royal Magic
• Second-hand Magic
• Summer Magic
• Trapped in Time
• The Trouble with Magic
• Wednesday Witch
• What the Witch Left
• The Wishing Tree
• The Witch and the Ring
• A Witch in the House
• The Witch's Buttons
• Witch's Cat
• The Would-Be Witch
• Wrong Way Around Magic

• The White Mountains
  (The Tripods 1)
• The City of Gold and Lead
  (The Tripods 2)
• The Pool of Fire
  (The Tripods 3)
• When the Tripods Came
  (The Tripods Prequel)

• Over Sea, Under Stone
  (The Dark is Rising Sequence Prequel)
• The Dark is Rising
  (The Dark is Rising Sequence 1)
• Greenwitch
  (The Dark is Rising Sequence 2)
• The Grey King
  (The Dark is Rising Sequence 3)
• Silver on the Tree
  (The Dark is Rising Sequence 4)

• The Field Guide
  (The Spiderwick Chronicles 1)

• The Twenty-One Balloons

• The Talking Parcel

• Half Magic
• Knight's Castle
• Magic by the Lake
• Magic or Not?
• The Time Garden
• The Well Wishers

• The Last of the Really Great Whangdoodles

• The Neverending Story

• The Everyday Witch
  (Beatrice Bailey 1)
• The Witches of Friar's Lantern
  (Beatrice Bailey 2)

• Inkheart
• The Thief Lord

• Mail-Order Wings

• Just Ella

• A Tale of Time City
• Believing is Seeing: Seven Stories
• Cart and Cwidder (Dalemark 1)
• Drowned Ammet (Dalemark 2)
• Charmed Life (Chrestomanci 1)
• Magicians of Caprona (Chrestomanci 2)
• Witch Week (Chrestomanci 3)
• The Lives of Christopher Chant (Chrestomanci 4)

• The Phantom Tollbooth

• The Ordinary Princess

• A Wrinkle in Time
  (Time Quartet 1)
• A Wind in the Door
  (Time Quartet 2)
• A Swiftly Tilting Planet
  (Time Quartet 3)
• Many Waters
  (Time Quartet 4)

• Ella Enchanted
• Two Princesses of Bamarre

• The Lion the Witch and the Wardrobe
  (The Chronicles of Narnia 1)
• Prince Caspian
  (The Chronicles of Narnia 2)
• Voyage of the Dawn Treader
  (The Chronicles of Narnia 3)
• The Silver Chair
  (The Chronicles of Narnia 4)
• The Horse and His Boy
  (The Chronicles of Narnia 5)
• The Magician's Nephew
  (The Chronicles of Narnia 6)
• The Last Battle
  (The Chronicles of Narnia 7)

• Black Horses for the King

• Beauty
• The Blue Sword
  (Damar)
• The Hero and the Crown
  (Damar)

• The Book of Dragons
• The Enchanted Castle
• Five Children and It
• Wet Magic

• The Silver Crown

• Tom's Midnight Garden

• Sandry's Book

• The Girl With the Silver Eyes

• Freaky Friday

• Harry Potter and the Sorcerer's Stone
  (Harry Potter 1)
• Harry Potter and the Chamber of Secrets
  (Harry Potter 2)
• Harry Potter and the Prisoner of Azkaban
  (Harry Potter 3)
• Harry Potter and the Goblet of Fire (Harry Potter 4)
• Harry Potter and the Order of the Phoenix
  (Harry Potter 5)
• Fantastic Beasts and Where to Find Them [by Newt Scamander]
• Quidditch Through the Ages [by Kennilworthy Whisp]

• Interstellar Pig

• Wish, Come True

• Backyard Dragon
• Too Much Magic

• The Thirteen Clocks

• A Hidden Magic

• The Castle in the Attic

• Dealing with Dragons
  (The Enchanted Forest 1)
• Talking to Dragons
  (The Enchanted Forest 2)
• Calling on Dragons
  (The Enchanted Forest 3)
• Searching for Dragons
  (The Enchanted Forest 4)