Curriculum choice for AP Computer Science A

With the amount of preparation you're describing, the only thing your students will likely need is a course that teaches them Java syntax and object oriented programming, as the AP CSA exam assumes knowledge of Java:

SHOW ALL YOUR WORK. REMEMBER THAT PROGRAM SEGMENTS ARE TO BE WRITTEN IN JAVA.

(from https://apcentral.collegeboard.org/pdf/ap-2020exam-sample-questions-computer-science.pdf)

Code.org has a nice list of Java curricula that specifically target the AP CSA outcomes, but really any "Fundamentals of Java" course or online tutorial would likely be just fine.