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Analysis · Year review

2021

Data quality: tagged · Papers: Paper 1 + Paper 2 · PCM trends

Structure

Exam pattern

Subject order: Physics → Chemistry → Mathematics

~19 questions per subject (approx., both papers)

  • Linked numerical stems and paragraph-style SC appear.
  • Coordinate Geometry jumps (~21% of Math).
  • Organic Chem share roughly doubles vs 2020.
Narrative

Year review

2021 stretches the paper slightly (19 Q per subject) and introduces more linked numerical stems — one setup feeding two answers. That format trains you to keep intermediate results clean. Math spreads more evenly: Algebra leads, but Coordinate Geometry rises sharply (8/38). Practise straight-line and conic links, not isolated circle drills. Physics still crowns Mechanics, with Electrostatics getting a noticeable bump via capacitance/field chains. Chemistry begins the Organic climb (8/38) while Physical remains large. Named-reaction linked numericals and coordination counts start to feel modern. Student focus: practise ‘one stem → two numericals’ without re-reading the entire paragraph each time.

Priorities

Key areas by subject

What to emphasise when revising this year’s papers.

Mathematics

Subject hub →
Algebrahigh

Complex, matrices, probability, P&C and sequences dominate the broad Algebra bucket every year.

Complex numbersMatricesProbabilityP&C / relations
Calculusmedium

Limits, AOD, definite integrals, area and DEs are the highest-yield single cluster.

AOD / extremaDefinite integrals & areaDifferential equations
Coordinate Geometrymedium

Conics (ellipse/parabola/hyperbola) often join with tangents, area or matching lists.

Ellipse / parabolaTangents & normalsIntersection geometry
Trigonometrylow

Equations, inverse trig and compound angles show up in SC/MATCH and linked stems.

Trig equationsInverse trigCompound angles
Vectors & 3Dlow

Planes, lines and vector products appear as multi-correct/numerical separators.

Planes & linesScalar/vector triple product

Tagged topic counts

  • Algebra17 · 44.7%
  • Calculus9 · 23.7%
  • Coordinate Geometry8 · 21.1%
  • Trigonometry3 · 7.9%
  • Vectors & 3D1 · 2.6%
Mechanicshigh

Rotation, rigid body and collisions remain the largest Physics share.

Rotation / rollingCollisions & COMWork–energy
Electrostaticsmedium

Fields, capacitance and dipoles often pair with other EM ideas.

Field / potentialCapacitanceDipoles
Magnetism/EMI/AClow

Mutual inductance, LC resonance and rotating loops rose again in 2024–26.

EMIAC / LCMagnetic fields
Opticslow

Ray optics, prisms, polarization and diffraction recur across both papers.

Ray optics / lensesWave opticsPolarization
Thermodynamics/Kinetic Theorylow

Multi-step cycles and Carnot cascades reward careful PV reading.

CyclesCarnotKinetic theory
Current Electricitylow

Circuits and galvanometer methods appear in SC/NUM/experimental mixes.

CircuitsGalvanometer
Modern Physicslow

Atoms, nuclei and photoelectric are compact but high-accuracy scoring.

AtomsNucleiPhotoelectric
Waves/SHM/Soundlow

SHM in fluids, resonance tubes and wave equations stay regular.

SHMSound resonanceWave equations

Tagged topic counts

  • Mechanics17 · 44.7%
  • Electrostatics7 · 18.4%
  • Magnetism/EMI/AC3 · 7.9%
  • Optics3 · 7.9%
  • Thermodynamics/Kinetic Theory3 · 7.9%
  • Current Electricity2 · 5.3%
  • Modern Physics2 · 5.3%
  • Waves/SHM/Sound1 · 2.6%
Physicalhigh

Thermo, equilibrium, electrochem, kinetics and solutions carry calculation weight.

ThermodynamicsEquilibrium / electrochemSolutions / kinetics
Inorganichigh

Coordination isomerism, bonding/VSEPR and p-block remain reliable scorers.

CoordinationBonding / VSEPRp-Block
Organicmedium

GOC, carbonyls, named reactions, biomolecules and practical analysis are rising.

GOC / carbonylNamed reactionsBiomolecules / polymers

Tagged topic counts

  • Physical18 · 47.4%
  • Inorganic12 · 31.6%
  • Organic8 · 21.1%
Execution

Exam strategy

  • When you see a linked stem, write shared quantities (energy, capacitance, slope) once in the margin.
  • Schedule an ellipse/parabola + tangent set before attempting 2021 Math.
  • For Chem, pair Physical numericals with one Organic mechanism drill the same evening.
Connections

Mixed questions from 2021

Multi-concept stems with knowledge bridges.

Mathematics2021 · Paper 1 · Q8–Q10linked-numerical

Straight-line linked numerical stem

Coordinate Geometry – Straight line+Linked numerical stems+Distance / intercept algebra

Knowledge bridge

Step 1: extract all shared geometric data from the paragraph once. Step 2: answer the first NUM (slope/intercept/distance). Step 3: reuse intermediates for the linked follow-ups without re-deriving from scratch.

Why it feels hard

Early example of Advanced’s linked-stem tax on organisation.

What to practise

Box shared quantities at the top of linked stems — treat them as a mini formula sheet.

2021 year review →Mathematics notes →Quick card →Syllabus →
Physics2021 · Paper 1 · Q6–Q9linked-numerical

Capacitance/field linked numerical chain

Electrostatics – Capacitance+Electric field+Linked numericals

Knowledge bridge

Step 1: draw the capacitor/field configuration and label charge/potential. Step 2: solve the first NUM for a base quantity (C, E, V). Step 3: propagate that value through linked asks (energy, force, series/parallel changes).

Why it feels hard

Long electrostatic chains amplify one early algebra mistake.

What to practise

In linked EM stems, verify units of the first answer before continuing.

2021 year review →Physics notes →Quick card →Syllabus →
Chemistry2021 · Paper 1 · Q5–Q9linked-numerical

Organic linked NUM + Physical thermo/mixed

Organic named/reactions (linked)+Physical thermodynamics+Metallurgy / mixed Physical

Knowledge bridge

Step 1: resolve the Organic linked numerical using reaction stoichiometry. Step 2: switch to thermo/mixed Physical NUMs with fresh variables. Step 3: keep metallurgy facts (if present) as recall, not calculation, items.

Why it feels hard

Branch switching inside one NUM section.

What to practise

Label each Chem NUM as Org/Phy/Inorg in the margin before solving.

2021 year review →Chemistry notes →Quick card →Syllabus →
All year reviewsPCM trendsAll mixed questions