The shelf tag has approx 13.5k cards whereas the subjects tag has 8.7k cards
I know that shelf no dupes is the gold standard for step 2 prep, but I love the organisation under the subjects tag
So I have 2 questions-
Why is there a 5k difference between the two tags?
Can I do just the subjects tag and do well on shelf exams and step 2 or do I have to do all the shelf cards?
Is there any way I can do just the cardio cards first under the shelf tag followed by pulm, nephro etc?
Hello,
I would be happy to help. 
In short, because they were tagged differently. This article can walk you through the specifics: 🏷️ What do all the tags mean in the AnKing Step Deck?
It’s hard to predict what is enough for any individual person to do well, unfortunately. A lot of that will be individual specific and reliant on a few factors, outside of specific tags so I don’t know that it’s possible to offer specific assurances there, I’m sorry to say.
The Shelf tags are organized by rotation, rather than underlying subject. It might be possible to mix-and-match tags and arrive at a way to focus on a single subject, though I can’t say I’ve done it or known anyone who has done it, and in all likelihood it may end up in mixed results owing to the way that tagging is done.
Please let me know if that answers your question, and if there’s anything else I can help with.
Thank you so much!
Your response was extremely helpful! 
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