This app was mentioned in 1 comment, with an average of 2.00 upvotes
The memorization in A&P was the hardest part. If the class uses the textbook published by Pearson I cannot recommend the companion study app highly enough. The intro biology class will make a few of the concepts covered in A&P a little easier though, FWIW.
I personally haven't worked as a CNA, but several of my classmates have, and they all are doing fine.
Edit: the app is called MyLab/Mastering Study Modules. Android link: https://play.google.com/store/apps/details?id=com.knowledgefactor.pearson