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Zanki — Step 1 Coverage Audit

The Zanki Step 1 deck covers 81.9% of the USMLE Step 1 content outline — 738 out of 901 canonical subtopics — making it one of the most comprehensive free Anki resources available for Step 1 prep. For most students, Zanki alone is not enough, but it gets you further than almost any other single deck. The 163 complete gaps and 120 thin spots (1–3 cards) mean targeted supplementation is essential, not optional.

Zanki (JF Update) contains 18,388 total cards, with 18,345 mapped to Step 1 subtopics. It was built by aggregating Zanki's original content with updates from the medical school Anki community, and it's the default starting deck for a large portion of Step 1 studiers. Its strongest systems are Biochemistry (96.4% coverage, 3,715 cards), Renal (93.0%, 1,589 cards), and Gastrointestinal (90.5%, 1,897 cards). If you need dense, well-tested content in those areas, Zanki delivers. The weakest areas are General Pharmacology (30.6% coverage, only 117 cards across 36 subtopics), Microbiology (70.0%), and Psychiatry (72.0%) — these are the systems where relying on Zanki alone will leave real holes on exam day.

This page is the only independent coverage audit of the Zanki Step 1 deck mapped against the full 901-subtopic USMLE Step 1 outline. The data here identifies exactly which subtopics have zero cards — including high-yield gaps like Chemical Mediators of Inflammation, Phases of Wound Healing, HBV Serology Patterns, and Adrenergic Agonists (Direct) — so you can study smarter instead of discovering gaps during practice blocks.

18,345 Step 1 cards
738/901 subtopics covered
81.9% coverage
438/481 high-yield (91.1%)

Step 1 cards = cards that mapped to our 901-subtopic Step 1 content outline. Cards covering other material are excluded.

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Coverage by area

AreaCoverageCards
Biochemistry53/55 (96.4%)3,715
Renal53/57 (93.0%)1,589
Gastrointestinal67/74 (90.5%)1,897
Hematology and Oncology55/61 (90.2%)1,374
Neurology and Special Senses53/59 (89.8%)2,773
Endocrine46/53 (86.8%)1,322
Cardiovascular55/64 (85.9%)2,250
Immunology28/33 (84.8%)492
Musculoskeletal, Skin, and Connective Tissue61/72 (84.7%)1,634
Public Health Sciences25/30 (83.3%)425
Reproductive64/80 (80.0%)1,573
General Pathology21/27 (77.8%)144
Respiratory50/65 (76.9%)1,642
Psychiatry54/75 (72.0%)604
Microbiology42/60 (70.0%)271
General Pharmacology11/36 (30.6%)117
Total738/901 (81.9%)18,345 mapped

Gaps — zero cards (163 subtopics)

High-yield gaps

Other gaps

Thin spots — 1 to 3 cards (120 subtopics)

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How to pair Zanki with other resources

The biggest holes in Zanki are in General Pharmacology, Microbiology, and Psychiatry — and your pairing strategy should target those first. For General Pharmacology (30.6% coverage), Boards & Beyond pharmacology lectures paired with a dedicated pharm deck like Pepper Pharm will fill the mechanism and receptor content Zanki skips entirely, including Adrenergic Agonists (Direct), which has zero Zanki cards despite being high-yield. For Microbiology (70.0%), Sketchy Micro remains the standard supplement — Zanki's 271 cards across 42 subtopics leave 18 microbiology subtopics completely uncovered. For Psychiatry (72.0%), First Aid reading plus targeted UWorld questions will patch the 21 uncovered subtopics more efficiently than hunting for add-on decks.

For the gaps in General Pathology — specifically Chemical Mediators of Inflammation and Phases of Wound Healing, both at zero cards — Pathoma is the direct fix. Watch the relevant Pathoma chapters and make your own cards or pull from a Pathoma-specific deck. The Cardiovascular gaps (NSTEMI Risk Stratification, Right Ventricular Infarction) and the Endocrine gaps (Osteoporosis, Osteoporosis Pharmacotherapy) are best addressed through Boards & Beyond videos and active UWorld review, where the clinical vignette format forces retention better than passive cards for these reasoning-heavy subtopics.

Frequently asked questions

Is Zanki enough for Step 1?

Zanki covers 81.9% of the USMLE Step 1 content outline (738 out of 901 subtopics), making it a strong foundation but not a complete resource on its own. It has 163 subtopics with zero cards and 120 with only 1–3 cards, including high-yield gaps in General Pharmacology, Microbiology, and Psychiatry. Most students who score well pair Zanki with Boards & Beyond, Pathoma, and Sketchy to close those gaps.

How many cards are in Zanki?

The Zanki (JF Update) deck contains 18,388 total cards, of which 18,345 are mapped to USMLE Step 1 subtopics and 12 are out of scope. It is one of the largest single Anki decks available for Step 1 prep. Card density varies significantly by system — Biochemistry alone accounts for 3,715 cards, while Microbiology has only 271.

What does Zanki not cover for Step 1?

Zanki has 163 completely uncovered Step 1 subtopics, with the worst gaps in General Pharmacology (only 30.6% of subtopics covered), Microbiology (70.0%), and Psychiatry (72.0%). Specific high-yield zero-card gaps include Chemical Mediators of Inflammation, Phases of Wound Healing, HBV Serology Patterns, Proton Pump Inhibitors, and Adrenergic Agonists (Direct). These are not obscure topics — several appear repeatedly in UWorld and on Step 1.

What is the weakest system in the Zanki Step 1 deck?

General Pharmacology is by far the weakest system in Zanki, covering only 11 of 36 subtopics (30.6%) with just 117 cards — the lowest coverage rate of any system in the deck. Microbiology (70.0%, 42/60 subtopics) and Psychiatry (72.0%, 54/75 subtopics) are the next weakest. Students relying on Zanki for pharmacology are missing more than two-thirds of the tested content outline in that system.

This analysis maps every card in the deck against Lacunos's independently authored content outline — not an official exam blueprint. Coverage percentages reflect how many of our cataloged subtopics have at least one card. Gaps and thin spots indicate areas where the deck has zero or few cards relative to our outline, not necessarily topics the exam will test.

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