First Aid is a list of facts with no teacher. The First Aid Guide added the teacher to every page. Now there is a tutor on top of every page — one you can actually ask.
The First Aid Guide takes all 646 pages of First Aid and teaches them one page at a time. Every page carries the same five parts, in the same order:
| Focus On | the 1 idea on this page that the exam actually cares about |
| Concept Walkthrough | the page explained in plain language, in reading order |
| How is this tested? | Common Confusion → Core Concept → The Trap → Your Approach |
| Key Takeaways | what to keep after you close the page |
| Test Yourself | MCQs on that exact page — not that chapter, that page |
Underneath are the ELI5s — the plain-English stories behind each heading, explained in the ELI5 guide. If you have never seen a Guide page, see one before you read on.
That covers most of what a student gets stuck on. Most — not all. At 11pm, on page 603, when the walkthrough still hasn’t landed, there is nobody to ask. That is the gap the tutor closes.
It is a round button on every screen — “Ask anything”. Tap it, type what you don’t understand, and it teaches it to you right there. You never leave the page you were on.
I built it on Gemini Pro, Google’s strongest model. For medicine it is the best tutor I have found — it explains, it doesn’t just recite.
Open it on a First Aid Guide page and the top of the chat reads “You’re on First Aid guide · Renal · page 603”. It knows the system, the page, the screen — FA Guide, Anki, your schedule, an assessment.
So you skip the setup. You don’t type “I’m studying renal, I’m on the nephron page, I don’t get…”. You type the 4 words you’re actually stuck on, and it answers for the page you’re on.
This is the part that makes it a tutor and not a search engine. Every study answer is built the same way, every time:
| 1 · What it is (and why it happens) | explained as if to a bright 5-year-old — everyday words, 1 real-life analogy, every abbreviation spelled out |
| 2 · How it happens | the actual mechanism, step by step, in order — still simple, now complete |
| 3 · Why it matters for the exam | how the USMLE tests it: the classic vignette clue, the buzzwords, the commonest wrong answer, the lab or graph shift, and 1 bolded line to memorise |
Step 3 is the one nobody else gives you. It is the same thing the Guide’s “How is this tested?” block does for the page — now on demand, for your exact question.
Ask “why do ACE inhibitors cause a cough?” and you get: first the plain story (the enzyme that clears a cough-causing chemical is switched off, so it builds up); then the mechanism (ACE also breaks down bradykinin; block ACE and bradykinin accumulates in the airway); then the exam (dry cough on a new antihypertensive → switch to an ARB, because ARBs don’t touch bradykinin — and the same bradykinin explains angioedema). Three layers, one answer, about a minute.
Ask it “How do I reset my schedule?” or “Give me a quick tour of the app” and it switches shape: short numbered steps, naming the exact screen and the exact button.
When a free guide answers your question better than a chat can, it says so and links it — the road to exam day, the new Anki modes, how to do UWorld. It is told never to invent a screen or a link that doesn’t exist.
The tutor is not a fifth resource. Before UWorld you attack First Aid from 4 angles — read it, test it, think with it, recall it (the RPSR method explains why). The tutor is the teacher you call in when any one of those 4 stalls:
| Reading the Guide | the walkthrough or an ELI5 doesn’t land → ask, on that page |
| Test Yourself | you got 1 wrong and the explanation didn’t fix it → ask why your answer was wrong |
| Mehlman | you can’t see how a clue rules an option in or out → ask for the exam step (Mehlman guide) |
| Anki | a card keeps coming back as “Forgot it” → ask, right on the card (Anki guide) |
| UWorld review | an explanation you read twice and still don’t get → paste the idea and ask |
Ask the confusion, not the topic. “Why is renin high in renal artery stenosis but low in Conn’s?” beats “explain renin”.
Say what you think first. “I think X because Y — where am I wrong?” gets you a correction aimed at your actual mistake.
Vague is fine. Type “I don’t get this” on a page and it will either ask you 1 short question or pick the most likely confusion and explain that.
Then go back to the page. The tutor explains; First Aid is still the address. Close the loop with the Test Yourself MCQs.
You get 30 questions a day, and your chats are saved so you can scroll back. Answers are AI-generated — if one surprises you, check it against the First Aid page. That is the right habit anyway: the page is what the exam tests.
The First Aid Guide — the 646 pages the tutor is built on
ELI5, Test Yourself and Rule out — the page’s own explanations, and elimination
Anki: two decks, two modes, First Aid on every card — where the tutor helps most
The RPSR method — the 4 angles on First Aid before UWorld
Week 1 to exam day — the whole road, before you start