The following is the material I recommend. It is important to practice with the many real past exams.
The test is done differently in 2020 due to the lockdown, Convid-19 and stay-at-home orders.
You don’t need to do perfectly on practice tests. You need about a 68% on the exam to get a 5.
Officially released real AP exams
https://crunchymath.weebly.com/uploads/8/2/4/0/8240213/ap_multiple_choice.pdf All officially released multiple choice exams
https://apcentral.collegeboard.org/courses/ap-calculus-ab/exam/past-exam-questions 30+ past free answer tests.
http://fairfaxcountymathandphysicstutor.com/ap_calculus_multiple_choice_problems Another individual tutor’s site. Has officially released problems classified by topic. I strongly recommend this resource.
Books
Barrons AP Calculus This is the standard study guide. I have gone through it thoroughly.
Thomas et al. Calculus was the standard AP calculus textbook when I was in school. It can be found in various editions used on Amazon. It has huge numbers of problems. Thomas taught at MIT.
Guides and Blogs
https://blog.prepscholar.com/ap-calculus-ab-exam-test Has good information. Site is really good at producing blogs for their SEO.