2003 Free Response.
http://www.youtube.com/watch?v=6RWd1ytJbvM
http://apcentral.collegeboard.com/apc/members/repository/ap03_sg_calculus_ab_26472.pdf
1998 AP exam answers.
http://home.roadrunner.com/~askmrcalculus/AP%2098%20MultC.html
How do I know if I will pass the AP exam?
http://apcentral.collegeboard.com/apc/public/repository/calculus-released-exam-2008-scoring-worksheet.pdf -- worksheet
http://aphaven.com/haven/ap-calculus/calculator -- on-line calculator
http://appass.com/calculators/calculusab/ -- on-line calculator
Requested topic Rates of change -- radius
https://www.khanacademy.org/math/differential-calculus/derivative_applications/rates_of_change/v/rates-of-change-between-radius-and-area-of-circle
http://home.roadrunner.com/~askmrcalculus/AB%2098%20MC%20C.html -- 1998 MC exam answers.
http://www.online.math.uh.edu/apcalculus/exams/
practice exams with answers
https://www.khanacademy.org/math/calculus/ap_calc_topic
explains free response ?'s
http://crunchymath.weebly.com/uploads/8/2/4/0/8240213/ap_multiple_choice.pdf
http://tajames.net/calculus/Practice_Book_Solutions.html (answers only
http://www.calculusquestions.org/help/index.php?page=apmultiplechoice
(choose ones with answers available)
old tests online
http://home.roadrunner.com/~theatons/AB%20Sample%20Questions%20Acorn%20Book%20CB.pdf
sample AP ?'s
http://go.learningpod.com/blog/complete-practice-set-for-ap-calculus-ab-bc
***practice ?'s by topics
http://www.education.com/study-help/article/practice-problems/
***limits
http://wowmath.org/Calculus/Calculus%20AP%20Exam.html
videos free response & other key ideas