The one idea everything hangs on: biochem is a prerequisite, not an opener. Almost everyone studies it in the worst order — all of it, cold, on day one — so they understand none of it and forget what stuck before the systems that use it arrive. You do the opposite: split it into pieces and drop each one right before the system that needs it. Same biochem, completely different retention.
The math (why this isn't optional)
~64 h → 30%
Front-loaded as one block: more hours, low retention by the time it's tested.
~35 h → 80%
Split & placed before each system: fewer hours, it actually sticks.
~29 h saved
A whole extra system's worth of time — and you remember it.
The 3 rules
- Never open biochem on day one. It's a prerequisite, not a foundation block. Cramming 40+ pages cold in week one is wasted — you'll forget it before week six when HemOnc, Endo and Neuro need it.
- It's not one block — it's pieces, each placed before the system that depends on it. Sickle cell is one amino-acid swap (glutamic acid → valine). Learn it in isolation and it's a fact you lose; learn amino acids the week before HemOnc and it's obvious.
- Where you study it matters as much as when. Do it in the Vault biochem section: every First Aid page broken down, the right HY video attached, a concept walkthrough, page-by-page MCQs so you test the second you read, and an ELI5 for the pages that usually make people cry.
The 7 placements (actual schedule order)
1
🧬 Nutrition — vitamins, minerals, deficiencies
→ right before GITVitamin absorption and deficiency states present through the GI tract.
2
🧬 Metabolism — Carbohydrates
→ right before EndocrineGlycolysis, glycogen storage, insulin — diabetes is built on this.
3
🧬 Metabolism — Fats / Lipids
→ right before EndocrineEvery steroid hormone — estrogen, cortisol, testosterone — is built from cholesterol.
4
🧬 Cellular — organelles, signaling
→ right before Immunology / HemOncCell signaling and the machinery cancer hijacks.
5
🧬 Molecular — DNA/RNA, mutations, lab techniques
→ right before Immunology / HemOncMutations, oncogenes, and the molecular tools tested alongside cancer/immuno.
6
🧬 Metabolism — Amino Acids
→ right before Immunology / HemOncHemoglobin is amino-acid chains; antibodies are proteins; heme synthesis & porphyrias.
7
🧬 Genetics — inheritance, trinucleotide repeats
→ right before NeurologyHuntington's, Fragile X, hereditary disease — most of it shows up neuro.
Total biochem ≈ First Aid pages 32–92 · ~138 page-by-page Vault MCQs.
How you run each biochem day
- Read the Vault page (First Aid open) → watch the attached HY video for the hard pages.
- Do that page's MCQs the same day — test the moment you read.
- Hit a brutal page? Open the ELI5 for it before moving on.
- Move on only once the last page is locked.
Biochem pieces are Vault-only — no Mehlman, no separate Anki deck, no UWorld block of their own. Short, surgical, and reinforced by the system you start the next day.
The final move — tie it all together
★ After every biochem piece is done — before revision
Once you've completed all 7 placements across the systems, do one clean pass of the Mehlman Medical Biochemistry playlist — start to finish, once — right before you begin your revision phase. It ties every scattered piece back into one picture.
🔗 📺 Mehlman Medical — Biochemistry playlist
Lock rules — what can't change
🔒These system orders are fixed: Reproductive → Endocrine · MSK → Psychiatry · Immunology → HemOnc.
🧬And every biochem piece stays before its system: Nutrition before GIT · Carbs & Fats before Endocrine · Cellular, Molecular & Amino Acids before Immuno/HemOnc · Genetics before Neuro.
Bottom line: stop treating biochem as a wall you climb at the start. Slice it into 7 small pieces, drop each the week before the system that uses it, do it in the Vault, then close with one Mehlman pass — and it stops being the subject that makes people quit. It becomes the easiest 30 hours on your calendar.