The popular TOEFL prep books for 2024 are The Official Guide to the TOEFL Test, Fifth Edition (5th Edition), Barron's TOEFL iBT Superpack, 2024 Edition, TOEFL iBT Prep Plus 2024-2025 by Kaplan, Barron's TOEFL iBT with Audio CDs and CD-ROM, 14th Edition, and Princeton Review TOEFL iBT Prep, 2024.