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Students may be interested in the Saylor Biology courses, which are free equivalents to college-level classes.
Biology Prep - "Assess your knowledge in biology to target your study time more effectively."
NOTE: There are so many different biology resources available, you have a wide selection to choose from. Take some time to look them over and decide which ones would work best for you.
CLEP Biology - exam description and sample questions.
Carnegie Mellon University's Introduction to Biology
Biology (Foundations) online course - requires registration
Biology Upper Secondary - 1 online course - continues from Biology (Foundations)
Biology Upper Secondary - 2 online course - continues from Upper Secondary - 1
Khan Academy Biology
Online Biology Textbook
Complete your studies and take the CLEP, or consider StraighterLine's Introduction to Biology.
Help, if you need it:
Virtual Labs - 31 virtual lab experiments
Virtual Pig Dissection
Virtual Cat Dissection
Biology lectures - requires free iTunes software
MIT's Open Course Biology
University of Arizona's The Biology Project
Biology Tutorial Sites
Unseen Life on Earth - 12 half-hour videos about microbiology
Biology in Motion
TESTING PRACTICE AND FINAL EXAMS:
Biology exams - many biology exams, with multiple choice and short answer questions, going back to 2002
Recommended Course of Study:
Pre-test your knowledge with the Biology Prep site. Complete the Carnegie Mellon online course and take time to watch the videos (and complete the short quizzes with each video). Read through the topics at the CK-12 and HippoCampus websites. Explore the virtual labs. The additional resources are provided for extra practice and help. Finish by taking some practice quizzes and then any of the End-of-Course/Biology exams.