I post TONS of review materials for students on my website (apbiopenguins.weebly.com) and I host a daily review for the AP Exam starting in February each year.
In addition, I aid many teachers with resources through my newsletter.
I complete ALL of this stuff at no charge because I feel that access to good resources should not be dependent on your ability to pay for them. At the end of each review season, I ask students to donate their score (a student scoring a 5 on the AP Bio exam could donate $5, a 4 donated $4, and so on).
Thank you for your support and remember: AP Bio Penguins are Dressed for Success!