Class 12 Chemistry Board Exam — A Chapter-Wise Strategy
Class 12 chemistry is not one subject with ten chapters. It is three subjects — physical, inorganic and organic — bound into one book and examined in one paper. Each of the three rewards a completely different kind of study. Students who revise all ten chapters the same way are the ones who run out of time in February and then say the paper was "tough".
This is a chapter-wise plan built around that difference.
First: get the marks from the source, not from a WhatsApp forward
Unit-wise weightage changes between sessions, and the syllabus itself was rationalised in recent years — some chapters older students studied are no longer in the paper. Before you plan anything, download the current session's syllabus and sample paper from your own board and write the unit marks on the first page of your notebook by hand. Any article, including this one, that prints exact mark numbers can go out of date; your board's own document cannot. Plan from that.
The three kinds of chapters
| Type | Typical chapters | What the exam asks | How to revise it |
|---|---|---|---|
| Numerical (physical) | Solutions, Electrochemistry, Chemical Kinetics | Substitute into a formula, get a number, state the unit | Solve. Reading these is almost useless. |
| Memory + reasoning (inorganic) | d- and f-Block, Coordination Compounds | "Why is …?" comparisons, IUPAC names, isomer counts, magnetic moment | Short daily doses + self-made comparison tables |
| Mechanism + conversion (organic) | Haloalkanes, Alcohols/Phenols/Ethers, Aldehydes/Ketones/Acids, Amines, Biomolecules | Reagent-to-product, conversions, distinguishing tests, named reactions | Reaction maps drawn from memory, weekly |
Check this table against your current syllabus — the point is the method per type, not the exact chapter list.
Physical chapters: solve, don't read
For Solutions, Electrochemistry and Kinetics there is a small, fixed set of formulas and a large set of ways they can be dressed up. Make one A4 sheet with every formula and, next to each, the unit of the answer. Then solve.
A 6-day physical block that works
Day 1: Solutions — concentration terms (molarity, molality, mole fraction) — 25 numericals.
Day 2: Solutions — colligative properties and van't Hoff factor — 20 numericals.
Day 3: Electrochemistry — Nernst equation and cell EMF — 20 numericals.
Day 4: Electrochemistry — conductance, Kohlrausch, electrolysis — 20 numericals.
Day 5: Kinetics — order, rate law, integrated first-order and half-life — 25 numericals.
Day 6: Mixed set of 30 problems from all three, shuffled, timed at 90 minutes.
Day 6 is the one that matters. In the exam the questions arrive shuffled, and the real skill being tested is recognising which formula applies — a skill you never practise if you only ever solve one chapter at a time.
Open the Nernst Equation Calculator →
Inorganic chapters: little and often
Coordination compounds and the d- and f-block are where marks are cheapest and most commonly thrown away. Nothing here is difficult; it is simply forgettable. So do not give it a block — give it 20 minutes every single day for three months.
Build three tables yourself, by hand, and rewrite them from memory once a week:
- Ligands: name, formula, denticity, and whether strong or weak field.
- Common complexes: IUPAC name, oxidation state of the metal, hybridisation, geometry, number of unpaired electrons, magnetic moment, colour.
- Transition-metal trends: atomic radii, ionisation enthalpy, oxidation states, catalytic behaviour — with one worked "why" for each.
Making the table is the study. A downloaded table teaches nobody anything.
Organic chapters: maps, not lists
Organic in Class 12 is one connected network: alcohol → aldehyde → acid → ester → amide → amine, with named reactions as the roads between them. Learn it as a map.
The weekly organic map drill. Take a blank A3 sheet. Put benzene in the centre. Without any book open, draw every product you can reach from it in one step, label each arrow with reagent and conditions, then continue outward for a second step. Do it once a week for the whole of Class 12. By December the sheet fills itself, and conversion questions — "convert ethanol to acetic acid in three steps" — stop being puzzles and become route-finding on a map you have already memorised.
A realistic three-month schedule
| Period | Main work | Daily side work |
|---|---|---|
| Month 1 | All physical chapters, numerical-first | 20 min inorganic tables + 1 organic map/week |
| Month 2 | All organic chapters, conversions and mechanisms | 20 min inorganic + 10 physical numericals |
| Month 3 | Full papers under timed conditions, then repair weak areas | NCERT in-text and exercise questions, end to end |
Two rules for month 3. First, every paper must be written in one three-hour sitting with a clock — a paper solved in pieces across a day measures nothing. Second, spend more time correcting the paper than writing it: for every wrong answer, write one line saying whether it was a concept gap, a silly slip, or a time problem. After four papers that list tells you precisely what to fix, and it is usually shorter than you fear.
What loses marks even when you know the chemistry
- Skipping NCERT. Board questions are built around the NCERT text and its exercises. A student who does ten reference books and not the NCERT is preparing for the wrong paper.
- Missing units and states. mol L⁻¹, kJ mol⁻¹, (aq), (g) — these carry real marks in step-marking.
- Unbalanced equations. Balance every equation you write, even in a theory answer. Also balance charge in ionic ones.
- Writing an essay for a 2-mark question. Marks follow points, not length. Answer in the number of points the marks suggest.
- Leaving practicals to the last week. The practical component is a large, easy, and completely predictable share of the total. Keep the record file current from day one.
Verify your physical-chemistry numericals as you practise. The free calculator suite covers molarity and dilution, the Nernst equation, rate constants and half-life, van't Hoff factor and more — use it to mark your own work.
Open the Molarity & Concentration Calculator →Need the chapters taught properly rather than just revised? ABC Chemistry runs Class 11–12 chemistry coaching at the Gurugram centre and online classes across India — details at abcchemistry.in. For one-to-one home tuition within Delhi, Noida or Gurgaon, see delhihometutor.com.