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Free Gen Chem & Organic Chemistry Notes for the DAT
Short answer: the best free organic chemistry review for the DAT is a combination of Khan Academy, Chemistry LibreTexts, and Master Organic Chemistry for content, plus the ADA's own free practice test and a handful of Reddit-shared PDFs for practice. That combination can teach you essentially every mechanism and reaction on the exam's outline for free. It cannot tell you if you're fast enough or give you the kind of question-level feedback that turns "I understand this" into a real score, which is where free resources plateau.
We scored in the top 3% on the DAT before building DATPractice, and gen chem and organic chemistry are where students burn the most time on the wrong free resources. Below is what's worth using, what to skip, and what free notes structurally can't do for you.
The Best Free Organic Chemistry Review for DAT Prep
For content review, three free sources cover almost the entire DAT organic chemistry outline:
- Khan Academy's organic chemistry unit. Built for the MCAT, but the mechanism-level content (SN1/SN2, elimination, addition, oxidation-reduction, spectroscopy basics) overlaps heavily with what the DAT tests. Video-first, well-sequenced, completely free.
- Master Organic Chemistry. A free website written by a chemistry educator, with clear, mechanism-focused explanations and reaction maps that are genuinely some of the best free organic chemistry writing online. Best used to fill in the "why" behind a mechanism after a first pass elsewhere.
- Chemistry LibreTexts. An open-access textbook library covering both gen chem and organic chemistry in full textbook depth, useful when you need the complete explanation behind a topic rather than a quick summary.
Used together, these three will teach you the chemistry itself as well as most paid content review will. The gap between free and paid shows up later, in practice and feedback, not in the teaching.
Free DAT Gen Chem Notes (PDF and Otherwise) Worth Using
There's no single official free DAT gen chem notes PDF that the ADA publishes, so what circulates is a mix of student-made outlines and repurposed course notes. Here's what to look for:
- Chemistry LibreTexts chapter PDFs. You can compile and export full chapters as PDFs for free, which gives you organized, textbook-accurate notes on stoichiometry, thermodynamics, equilibrium, acids and bases, electrochemistry, and kinetics without paying anything.
- Reddit-shared outline PDFs. Search r/DAT and you'll find condensed, student-made gen chem and organic chemistry outlines shared as free downloads. Quality varies a lot, so treat any single one as a supplement, not your primary source, and check it against the ADA's official topic list for gaps.
- Your own condensed notes. The highest-yield "free PDF" is usually the one you build yourself while working through Khan Academy or LibreTexts, because writing it forces you to actually process the material instead of just skimming someone else's summary.
Our guide on free DAT study materials Reddit actually recommends goes deeper on separating the outline PDFs worth downloading from the ones that are years out of date.
Free DAT Science Practice Questions Online
Notes get you to "I understand this." Practice questions are what tell you whether that understanding survives a four-choice, timed question written to trip you up. For free DAT science practice questions online:
- The ADA's own free practice test. This is the closest thing to an official source for real-format DAT questions, and it's worth taking early to calibrate how the actual exam phrases and paces gen chem and organic chemistry questions.
- Khan Academy practice problems. Useful for topic-by-topic checks right after you learn a concept, though they're not written to DAT-specific difficulty or timing.
- Free trials and sample question sets from DAT prep platforms. Most major platforms, ours included, let you try a slice of the question bank before you commit, which is a legitimate way to sample difficulty and question style for free.
The honest limit here: every free source above gives you a small, finite pool of questions. Once you've worked through them, you've seen the free supply, and the exam still has thousands of possible question variations you haven't touched.
| Free resource | Best for | Where it plateaus |
|---|---|---|
| Khan Academy (gen chem & orgo) | First-pass concept learning, video explanations | Not written to DAT timing, difficulty, or answer-choice traps |
| Master Organic Chemistry | Deep mechanism understanding, reaction maps | No practice questions, no science-section pacing |
| Chemistry LibreTexts | Full textbook depth, downloadable PDF chapters | Dense; not organized around what the DAT actually weights |
| Reddit-shared outline PDFs | Quick, condensed review of high-frequency topics | Inconsistent quality; can miss lower-frequency testable topics |
| ADA free practice test | Calibrating real question format and phrasing | One small sample; no personalized feedback on misses |
| Free trials from prep platforms | Sampling difficulty before committing to a full bank | Limited by design; not enough volume for real practice |
Where Free Notes and Free Practice Actually Plateau
Every source above is genuinely useful, and we'd tell you to use all of them. But there's a ceiling every student hits, and it's the same ceiling regardless of which combination of free resources you pick.
Free content review teaches you concepts. It rarely tells you which concepts the DAT tests heavily versus which show up once every few exams. General chemistry and organic chemistry are each only 30 of the 100 Survey of Natural Sciences questions, in 90 minutes total, so misallocating study time toward low-yield topics is expensive.
Free practice questions have the opposite problem: even when the content is right, there's rarely enough volume, and almost never real feedback. Getting a question wrong on a free quiz just tells you "wrong." It doesn't diagnose the concept behind the miss, or check whether you'd get a slightly different version right next time. That's the pattern behind a common forum complaint: students who felt like they "knew" gen chem and organic chemistry, then kept missing the same category of question on real practice tests without ever being told why.
Free Notes Teach the Concept. We Close the Loop.
Use the free resources above to learn gen chem and organic chemistry, then bring what you know to DATPractice to see if it actually holds up. Our 11,000+ question bank is written to real DAT difficulty, our AI tutor finds the exact concept behind every miss and re-teaches it to test depth, and 40 full-length practice tests mirror the real Survey of Natural Sciences timing so you know your score before test day, not after.
Start the Formula →Score higher, guaranteed — see site for terms.
A Simple Way to Sequence Free and Paid Resources
You don't need to pick one or the other on day one. This order wastes the least time:
- Weeks 1–3: Learn concepts with Khan Academy, Master Organic Chemistry, and Chemistry LibreTexts. Build condensed notes as you go.
- Around week 3: Take the ADA's free practice test and any free trial questions to check your knowledge against real DAT-format questions.
- The moment you plateau: Understanding a topic but still missing questions on it means free resources have done their job; you need exam-calibrated volume and feedback next.
- The rest of your timeline: Shift most remaining hours to timed, full-length practice with real feedback on every miss.
For a broader map of which free channels are worth your time beyond written notes, see our rankings of the best DAT YouTube channels for free DAT prep and our take on whether Khan Academy is enough for DAT prep on its own.
FAQ: Free Gen Chem & Organic Chemistry Notes for the DAT
Is there a free organic chemistry review for the DAT that's actually good enough?
Free resources like Khan Academy, Chemistry LibreTexts, and Master Organic Chemistry can teach you every mechanism and reaction on the DAT's organic chemistry outline, so the content itself is genuinely good enough for most students. What they can't give you is exam-calibrated difficulty or four-choice questions written the way the ADA writes them, so you'll still need timed, DAT-style practice to know if you can apply what you learned fast enough.
Where can I find free DAT gen chem notes as a PDF?
There's no single official free PDF, but Chemistry LibreTexts lets you compile and download full gen chem chapters as PDFs for free, and Reddit threads on r/DAT regularly share condensed, student-made outline PDFs covering the ADA's general chemistry topic list. Cross-check any crowd-sourced PDF against the ADA's official DAT guide topic outline before trusting it as complete, since student-made notes sometimes skip low-frequency but still testable topics.
Are there free DAT science practice questions online?
Yes. The ADA publishes an official free practice test that includes real-format science questions, Khan Academy's science content includes practice problems by topic, and several DAT prep platforms offer a free trial or sample question set you can use to gauge difficulty before committing to anything paid. None of these free sets is large enough to substitute for a full question bank once you're past the diagnostic stage.
Is Khan Academy enough for gen chem and organic chemistry on the DAT?
Khan Academy's chemistry content is a strong, free way to learn or relearn concepts, and it covers the large majority of what shows up in DAT gen chem and organic chemistry. It falls short on DAT-specific pacing, question difficulty, and answer-choice traps, since it wasn't built for this exam, so most students use it for content review and add DAT-specific practice on top. Our full breakdown is in our guide on whether Khan Academy is enough for DAT prep.
Do free DAT notes cover everything tested on the Survey of Natural Sciences?
The content coverage from good free sources is usually close to complete, since general chemistry and organic chemistry are stable, well-documented subjects that any solid textbook or course covers. The gap isn't content, it's calibration: free notes rarely tell you which topics the DAT tests heavily versus rarely, and they never simulate the 30 general chemistry and 30 organic chemistry questions you'll face in a 90-minute, 100-question science section.
How long should I spend on free resources before switching to paid DAT prep?
Most students get real value from free notes and videos for the first few weeks of content review, roughly the first third of a typical study timeline, before diminishing returns set in. Once you can explain a concept but still miss questions on it, that's the signal you've hit the ceiling of free content and need exam-calibrated practice and feedback instead.