Varsity Tutors offers free AP biology practice tests for high school students who want to earn college credit. Students looking for CLEP tests, which also allow students to earn biology credits, can find them on The College Board's website.
Since biology is such a broad subject, it can be difficult to find practice tests covering specific subject. Because of this, students might want to create their own tests using virtual or physical flashcards; Quizlet offers more than 5,000 biology-themed flashcard sets. The sheer volume of vocabulary required for biology means that many exams contain sections that largely depend on recalling definitions, making flashcards a great resource for practicing.