Of course the materials you get from your teacher should be your main source for studying for the May exams, but at times you may feel that you want to get some extra practice or maybe the viewpoint of a different source.
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The College Board offers several released exams and other items for you to use. Keep in mind that many of these released exams are from several years ago, and although still totally valid to help you, may not reflect the exact format of the exam you will write.
Please understand this is not an endorsement or requirement to purchase other materials. Many students do find the these study guides extremely helpful as they study. Search for them online at sites such as Amazon.ca or visit a bookstore to see if they have copies.
Be careful though to make sure that you purchase the most recent edition of the book. Barron's re-writes these books each year to reflect changes in the AP exams, and getting a "good deal" on a copy from a couple years ago might not be great for your mark.
Also, do not leave reading through these books until a couple nights before the exam. They are big and meant to help you study throughout the course, with special focus as we approach the weeks before the exams.
The College Board is offering YouTube videos of course content for all AP classes. These videos are made by teachers going through concepts in each pf the courses. Whatever class you are in, check them out here https://bit.ly/2JmNB6m .