I just got started with AnKing and was interested in using the MCAT deck. However, I wanted to use the UWorld review books and noticed that not all 6300 flashcards have tags for UWorld. Does this mean that not all the flashcards have been tagged yet or is tagging done, but there are only 5000 cards associated with the books in total? I’m just not sure if I should stick with Kaplan instead if that is the case, since it seems to have more flashcards tagged.
Hello,
I would be happy to help. 
It does indeed.
The tags are named, helpfully, ‘UWorld_Books’, as so:
This is true. As a general rule, no single resource will ever be 100% comprehensive, and the same is true when tagging a deck. No individual resource will have all of the cards tagged, as not single resource covers every conceivable detail
That being said, the deck was largely written, originally, alongside Kaplan so it will naturally have the greatest overall overlap.
In basically any/all cases, regardless of which resource someone uses, the end goal is to mature the entire deck so it ends up being one of those ‘all roads lead to Rome’ scenarios, no matter how you slice it.
No matter which resource you start with, none are comprehensive on their own and you’ll still likely want to complete the deck one way or the other. The same information is there, either way
Please let me know if that answers your question, and if there’s anything else I can help with.