Here’s some from my lists that are accessible for advanced 12 year olds:
*=Distopian
+=Fantasy
=Science Fiction
@=Alternative History
%=Historical Fiction
^=Paranormal
$=Contemporary Fiction

• Watership Down by Richard Adams+
• Kingdom of Engines by Nathan Van Coops *
• The Hero and the Crown and The Blue Sword by Robin McKinley+
• Ender’s Game by Orson Scott Card#
• The Hunger Games by Suzanne Collins*
• The Book Thief by Markus Zusak%
• Immortal Descendants by April White%+
• Scythe Trilogy by Neal Shusterman*
• The Kingdom of Back by Marie Lu%+
• Renegades Duology by Marissa Meyer*
• The Singularity series by Susan Kaye Quinn*
• The Great Library series by Rachel Cain*
• My Lady Jane by Cynthia Hand, Brodi Ashton, and Jodi Meadows@
• Warcross duology by Marie Lu*
• The Winternight Trilogy by Katherine Arden+
• Beyond and Before by Catina Haverlock and Angela Larkin^
• The Hitchhiker’s Guide to the Galaxy by Douglas Adams#
• The Selection Series by Kiera Cass*
• The Diabolic by S.J. Kincaid*
• The Lunar Chronicles by Marissa Meyer*
• Insignia trilogy by S.J. Kincaid*
• The Fairyland series by Catherynne M. Valente+
• Champion trilogy by Marie Lu*
• The Bern Saga by Hugh Howey#
• Nevermore series by Jessica Townsend+
• Faster Than Falling by Nathan Van Coops+
• The Thief series by Megan Whalen Turner+
• Wizard for Hire by Obert Skye+
• Artemis Fowl by Eoin Colfer+
• Matched by Ally Condie*
• Skyward series by Brandon Sanderson#
• Flipped by Wendelin Van Draanen$
• The Rule of Three series by Eric Walters*
• The Leviathan trilogy by Scott Westerfeld@
• The Bartimaus Trilogy by Jonathan Stroud+
• Lockwood & Co by Jonathan Stroud^
• The Abhorsen Trilogy by Garth Nix+
• Earthman Jack series by Mathew Kadish#
• The Riyria Revelations series by Michael J. Sullivan+
• The Girl Who Drank the Moon by Kelly Barnhill+
• Harry Potter by JK Rowling+
• The Swap by Megan Shull$
• Bounce by Megan Shull$
• Loot series by Jude Watson$
• The Reckoners series by Brandon Sanderson+
• Miss Peregrine’s Peculiar Children series by Ransom Riggs+
• The Giver Quartet by Lois Lowry
• The House of the Scorpion duology by Nancy Farmer*
• The Rithmatist by Brandon Sanderson+
• The Secrets of the Immortal Nicholas Flamel+%
• The Outsiders by SE Hinton$
• The Hobbit by JRR Tolkein+
• The Princess Bride by William Goldman+
• The Sign of the Beaver by Elizabeth George Speare%
• The Witch of Blackbird Pond by Elizabeth George Speare%
• Island of Blue Dolphins by Scott O’Dell%
• Bridge to Terabithia by Katherine Paterson+$
• Are You There God? It’s Me, Margaret by Judy Blume$
• Wizards of Once series by Cressida Cowell+
• Serafina and the Black Cloak by Robert Beatty%+
• Michael Vey by Richard Paul Evans+
• Wonder by RJ Palacio$
• The Luck Uglies by Paul Durham+
• Alcatraz vs the Evil Librarians by Brandon Sanderson+
• The Westing Game by Ellen Raskin$
• The Graveyard Book by Neil Gaiman+
• Coraline by Neil Gaiman+
• All Brandon Mull Books+
• The Kane Chronicles and The Percy Jackson series by Rick Riordan+
• The Inheritance Cycle by Christopher Paolini+
• Jack Blank series by Matt Myklusch+
• Maze Runner by James Dashner*
• Shannon Hale books+

*=Distopian
+=Fantasy
=Science Fiction
@=Alternative History
%=Historical Fiction
^=Paranormal
$=Contemporary Fiction

Here are some additional recos from members of the Book Club:

My soon to be 14 year old would add (in the fantasy genre) ALL the Rick Riordan books-she LOVES Magnus Chase and Trials of Apollo (after reading Percy Jackson/Heroes of Olympus, of course. Otherwise, spoilers!). Also the Rick Riordan Presents imprint-she loves the Aru Shah series, and also Tristan Strong…I love that she is learning more about other cultures and histories. They aren’t very distopian, but…they are well loved around here.
I like Kaye Thornbrugh’s Flicker series (fairy/fey stuff). (Flicker, Brightly, and Lights). Also Rainbow Rowell’s Fangirl (they recently published a manga version), and its subsequent spinoff Simon Snow trilogy, 1) Carry On 2) Wayward Son and 3) Any Way the Wind Blows (coming out in July).

All the Truth That’s in Me
Julie Berry

The Here and Now
Ann Brashares

The Here and Now
Ann Brashares

Patti Glaspy has an apocalyptic series that is pretty good- my 14 year old really enjoyed them and he kind of hates reading like I hate brusselsprouts.

The Giver Quartet
Ender’s Game Quintet
Skyward Series
Lockwood and Co
The Host by Stephanie Meyer
Rose Daughter by Robin McKinley

Leviathan series by Scott Westerfeld
Ugly series by Scott Westerfeld
Just Ella by Annette K Larsen
Kingfountain series by Jeff Wheeler
Salt to the Sea by Ruta Sepetys
The Seer and the Sword by Victoria Hanley
Stolen Songbird by Danielle Jensen
The Adoration of Jenna Fox by Mary E. Pearson
The Runaway King (Trilogy)by Jennifer A. Nielson
Walk on Earth a Stranger (Trilogy) by Rae Carson
Wildwood Dancing (Series) by Juliet Marillier
East by Edith Patton
Book of a Thousand Days by Shannon Hale
Across the Star Swept Sea by Diana Peterfreund
The Graveyard Book by Neil Gaiman
The City of Ember by Jeanne Duprau
The Hollow Kingdom (Series) by Clare B Dunkel
Beyond (Series) Angie Larkin & Catina Haverlock
Ella Enchanted by Gail Carson Levine
Scarlet (Series) by A.C. Gaughan
Pathfinder (Series) by Orson Scott Card
A long long Sleep by Anna Sheehan
Matched (Series) by Allie Condie
The False Princess by Ellis O’Neal
The Maze Runner (Series) by James Dasher
The Forrest of Hands and Teeth (Series) about scary zombies by Carrie Ryan
All books Brandon Sanderson