A free program for Android, by Varsity Tutors LLC.

The High School Biology Practice app is a tool for learning and practicing biology. This is a study tool for high school students, who may be learning about the various concepts of biology for the first time. It is a complete study tool for students to prepare for their exams. 

The app includes:

High-quality flashcards that cover all the concepts of biology. 

The ability to create and study on your own customized flashcards.

A wide selection of topics and a wide range of exams. 

The ability to study using the app or offline. 

A lot of practice exams and an option to take a test.