The high-yield list
- The mole concept and stoichiometry — the single most reliable source of questions, and the most reliably fumbled.
- Atomic structure and periodicity: electron configuration, trends across and down the table, and why they behave as they do.
- Chemical bonding and the properties that follow from bond type.
- Acids, bases and salts, including pH and titration arithmetic.
- Redox reactions and oxidation numbers.
- Electrochemistry: electrolysis, Faraday's laws, the electrochemical series.
- Organic chemistry: homologous series, functional groups, isomerism, and the standard reactions of alkanes, alkenes, alkanols and alkanoic acids.
- Rates, equilibrium and Le Chatelier's principle.
Everything here sits inside the official JAMB Chemistry syllabus, which changes very little from year to year, so there is no need to wait for the 2027 edition before you start. What is confirmed for 2027 so far is in our JAMB 2027 update.
Get the mole concept genuinely automatic
Moles connect mass, volume, concentration and number of particles, and JAMB tests those connections in every direction. If converting between them requires thought, every question built on top — titration, electrolysis, gas volumes, empirical formulas — costs you time you do not have. This is the one topic worth over-practising.
Organic chemistry rewards structure, not memory
Candidates try to memorise reactions one at a time and drown. The families behave predictably: learn what each functional group does, and the individual reactions follow. Focus on identifying functional groups quickly, naming compounds by IUPAC rules, and the handful of conversions between series that appear repeatedly.
The recall half
Some of the paper is simply knowledge: tests for gases and ions, methods of preparation, properties of named substances, industrial processes. There is no technique for these — but there is a sensible order. Learn the ones that appear in past papers first, and accept that the long tail of obscure facts is not worth the hours.
Where marks leak
Three places, consistently: unbalanced equations used in a calculation, unit and state confusion in gas problems, and misread significant figures in the options. All three are caught by the same habit — writing the balanced equation and the units down before calculating anything.
Questions people ask
Which JAMB Chemistry topics are highest yield?
The mole concept and stoichiometry, atomic structure and periodicity, chemical bonding, acids, bases and salts including pH and titration arithmetic, redox and oxidation numbers, electrochemistry, organic chemistry, and rates, equilibrium and Le Chatelier's principle.
Why does the mole concept matter so much?
It is the single most reliable source of questions and the most reliably fumbled. Moles connect mass, volume, concentration and number of particles, and JAMB tests those connections in every direction. If converting between them requires thought, every question built on top costs you time you do not have.
How should I approach organic chemistry?
By structure rather than memory. Candidates who try to memorise reactions one at a time drown. The families behave predictably, so learn what each functional group does and the individual reactions follow.
Where do Chemistry marks leak?
Three places consistently: unbalanced equations used in a calculation, unit and state confusion in gas problems, and misread significant figures in the options. All three are caught by the same habit of writing the balanced equation and the units down before calculating anything.
Practise this, don't just read it. The mole concept alone is worth several marks every year. Drill it until it is automatic. JAMBUDDY gives you timed mocks and 20,000+ real past questions inside Telegram, free for 14 days. Open @jamb_buddy_bot.