High School Biology

Free educational activities, models and software tools for teaching biology to high school students.

Baylor College of Medicine is offering a set of hands-on K-12 activities, grouped by grade level, that will enable parents and children to remain engaged in STEM learning.

CrashCourse Biology

This course is based on the AP Biology curriculum and also covers some introductory anatomy.

StuDocu

student-to-student knowledge exchange platform where students share knowledge, college notes, and study guides.

Study.com (Chemistry)

Comprehensive high school chemistry course to review all the information you've been learning in class.

High School Chemistry 

Free activities, simulations and software tools for teaching chemistry to high school students.

CrashCourse Chemistry

This course is mostly based on the 2012 AP Chemistry curriculum, but it also covers some introductory organic chemistry.

CK-12 Foundation - FlexBooks

CK-12 offers free, customizable digital textbooks known as FlexBooks. These textbooks cover a variety of science subjects, and students can access them online for self-paced learning.

Khan Academy

Khan Academy offers a comprehensive set of lessons and videos covering various science topics, including biology, chemistry, physics, and more. The content is organized by grade level, allowing students to learn at their own pace.