Geo-Scientist Prelims Chemistry (Paper II) strategy: 720 PYQs, 12 units, one plan
After the GS strategy video, many of you asked for the same thing for Paper II. This one is for the Chemist stream. I sorted all 720 Chemistry questions of 2021 to 2026 into the same 12 units as my test series (C1 to C12), and the plan follows from that. Here is the written version.
The whole strategy in three lines
- 300 marks is three-quarters of Prelims. Paper II, not GS, decides whether you clear Stage I.
- 40 · 40 · 40: inorganic, physical and organic. The split has not changed once in six years, so plan each block on its own.
- 29 topic families were asked in all six papers. Learn that list first; it is your sure-shot zone.
The marks math
A right answer gives 2.5 marks and a wrong one costs 0.83. You get 120 minutes for 120 questions. The Stage I cut-offs for the Chemist stream (General, out of 400) were 217, 224, 210, 193 and 167 from 2021 to 2025. Chemistry 180+ (60%) with GS 50 gives 230, above every one of them. That is the target I put on every result page of the test series.
Attempt about 100 questions with 80 right and you score 183. Attempt 110 and get only 82 right, and you score less, 181.7. In Paper II a careless attempt costs 0.83 marks, so the guessing rule matters even more: attempt only when you can cut two options.
What 720 PYQs say
| Block | Units (avg questions per paper) |
|---|---|
| Inorganic, Q1–40 | C1 Periodicity 15.7 · C2 Bonding, solids, complexes 13.8 · C3 Acids and bases 6.5 · C4 Volumetric analysis 4.0 |
| Physical, Q41–80 | C5 Gases 7.7 · C6 Thermodynamics 13.0 · C7 Solutions 7.0 · C8 Conductance 12.3 |
| Organic, Q81–120 | C9 Basic organic 7.5 · C10 Stereochemistry 10.2 · C11 Organic reactions 16.8 · C12 Rearrangements, NGP 5.5 |
- C4 gives exactly 4 questions every year, and primary standards came in all six papers.
- Physical is the numerical block: 85 of the 112 numericals in six years came from Q41 to Q80.
- Organic reactions (C11) nearly doubled, from 10 questions in 2021 to about 18 a year, often research-level mechanisms. And organic is drawn, not written: 200 of the 240 organic questions carry structures.
- No spectroscopy question in six years, one on kinetics, one on polymers and one on cell EMF. Leave those for Mains.
Three blocks, three games
- Physical, aim 34 of 40: formula-based numericals and standard concepts. A formula sheet and every PYQ numerical, twice.
- Inorganic, aim 30 of 40: facts and trends. One book, turned into one-page trend sheets. C3 and C4 are short and near-certain.
- Organic, aim 21 of 40: stereochemistry and NGP follow patterns, so do them first. In C11, attempt only with two options cut.
That is 85 right out of about 105: 85 × 2.5 − 20 × 0.83 ≈ 196 out of 300. With GS 50 you reach about 246 out of 400, well above the highest recent cut-off.
One book per block
- C1, C2: J. D. Lee, Concise Inorganic Chemistry, with NCERT 11–12 for s- and p-block facts.
- C3, C5–C8: Puri, Sharma and Pathania.
- C4: Vogel, titrimetry only.
- C9, C11, C12: Peter Sykes; Clayden's chapters on NGP, rearrangements and fragmentation for the 2025–26 level.
- C10: D. Nasipuri, Stereochemistry of Organic Compounds.
You already know chemistry. The job now is revision against the PYQs, not new reading. Make three sheets instead of notes: a formula sheet for physical, a trend sheet for inorganic and a mechanism sheet for organic.
The 10-week plan in short
Physical first because it gives the most marks per hour (weeks 1–3), then inorganic (weeks 4–6), then organic (weeks 7–9), and full mocks every other day in the last stretch before 10 January 2027. Each week ends with that unit's sectional test, the part tests close each block, and the mocks come last. About 4 to 5 hours a day for chemistry, with GS fitted around it.
In the exam hall
About 30 minutes for inorganic, 40 for physical and 35 for organic, then 15 minutes for a second pass over the marked questions. Never leave a physical numerical half-done: finish it or skip it. Keep 10 minutes for the OMR.
A word from me
Do not try to read everything again. Start with the sure-shot list in the PDF, test yourself every week with the matching C-test, and keep an error log. The students who clear this paper are not the ones who read the most; they are the ones who make the fewest careless attempts. If a unit troubles you, ask in the discussion group.
By VKC, your mentor. Integrated M.Sc. Chemistry, IIT Roorkee. CSIR NET Chemical Sciences, All India Rank 4. New posts are announced first on Telegram.