Start with high-confidence biology for teens books, then narrow by subgenre or adjacent topics.
First Steps
Jeremy DeSilva
The Selfish Gene
Richard Dawkins
Eve
Cat Bohannon
Epigenetics
Richard C. Francis
The Spark of Life
Frances Ashcroft
Neanderthal Man
Svante Pääbo
Evolution Gone Wrong
Alex Bezzerides, Joe Knezevich
Regents Exams and Answers: Life Science: Biology, 1st Edition
Barron's Educational Series, Barron's Educational Series
Everything You Need to Ace Biology in One Big Fat Notebook
Workman Publishing, Matthew Brown
How to Build a Human
Pamela S. Turner, John Gurche