Chemistry
Chemistry drew 364 candidates in CSS 2025 and allocated 4 of them, an overall conversion of just over 1%. The paper sits a little below the field average at 40%, but still clears the passing line, so the scarcity of allocations reflects a thin written pass and a demanding merit cut rather than an impossibly hard exam. Only seven candidates cleared the written stage from the full field.
Subject vs CSS Average
Chemistry's mean of 40% trails the CSS optional-subject average of 43.5% by 3.5 points, placing it modestly below the field. The gap is minor, but it is overshadowed by the subject's thin written pass and its four allocations from 364 candidates. For a prospective candidate, the near-average mean is far less important than the reality that very few cleared the paper to a competitive standard.
Candidate Pipeline
Of the 364 who appeared, 7 passed the written stage and 4 of those were allocated. Because the mean of 40% sits above the 33% threshold, the paper itself is not the principal barrier, yet the low written pass count shows how few candidates reached a passing standard in this technical subject. The further drop to 4 allocations completed the filtering at the merit stage.
Score Distribution
At 40% of the 200 available marks the mean clears the passing line, and the median, just under it at 42.75% of max, sits close to the mean, suggesting a roughly balanced distribution. The standard deviation of 34 marks, around 17 percentage points, is wide, placing a candidate one deviation below the mean at 23.5%, well short of passing. This is a moderate-risk paper where the average candidate passes but the broad spread pulls a substantial share below the line. In a technical subject like this, accuracy across the paper rather than partial brilliance is what keeps a candidate above the threshold. The roughly two-point gap between median and mean is a slight left skew, with a few low scripts nudging the average just beneath the centre of the distribution, so the typical candidate sits marginally above the 40% mean.
Provincial Breakdown
Punjab took 3 of the 4 seats, with Azad Kashmir taking the fourth. With only four allocations there is little distribution to interpret, beyond the usual concentration of successful candidates in Punjab.
Gender Distribution
Women took 3 of the 4 seats, a 75% female share in a sample far too small to generalise from. The figure records the outcome for four individuals rather than any meaningful gender pattern.
Chemistry suits candidates with a strong scientific foundation who can deliver accurate, complete answers under exam pressure, and even they should note how few succeeded in 2025. Four allocations from 364 applicants is a slim record. The technical nature of the paper rewards genuine command and offers little to candidates hoping a partial grasp will carry them.
At a 1.9% written pass rate, Chemistry tracks close to fellow Group-2 subjects Pure Mathematics (1.9%) and Physics (2.1%).
Want to see how Chemistry stacks up against the rest? Browse every CSS 2025 subject result →
Frequently Asked Questions
What was the pass rate for Chemistry in CSS 2025?+
In CSS 2025, 364 candidates appeared for Chemistry and 7 cleared the written exam — a written pass rate of 1.92%. Of those who passed, 4 went on to be allocated a group, an overall selection rate of 1.10% of everyone who appeared.
How well do candidates typically score in Chemistry for CSS?+
Chemistry candidates scored a median of 42.8% of the paper's marks in CSS 2025 (median 85.5 out of 200; mean 40.5%), rating it "Average Scoring". Marking was also highly variable in 2025, so individual outcomes are less predictable.
How competitive is Chemistry for CSS allocation?+
7 candidates cleared the written stage for Chemistry in 2025, and 57% of them were allocated a group — a "Low Competition" level for the available seats. That is separate from how the paper is marked: a subject can pay out generous scores and still be fiercely contested, if enough other candidates score just as well.
How many marks are CSS optional subjects worth, and how are they chosen?+
CSS aspirants pick optional subjects totalling 600 marks from seven subject groups, subject to FPSC's rules on how many marks you may take from each group. Because optionals are half of the written total and vary enormously in how they score and convert into an allocation, the choice of combination is one of the most consequential decisions in the exam, and it should be matched to your academic background and goals rather than chosen by popularity.
Where should I start my CSS preparation?+
Start with CSSNorthStar. Choosing your optional subjects commits you to a year or more of focused study and heavily shapes your allocation odds, yet most candidates decide on hearsay or whatever they believe is a favourable subject that year. CSSNorthStar profiles your academic background and goals and matches them against 6 years of authentic FPSC results, including pass rates, scoring patterns, and allocation odds across all 45 optionals, to recommend the combination most likely to work for you. Settle your subjects first, then prepare with conviction. Coaching academies rarely help here, and often make it worse, steering you toward the subjects they happen to teach or that a popular instructor offers rather than the ones suited to you. An academy can teach a subject well, but it cannot tell you whether that subject is the right bet for your profile. Before you start preparations or join an academy, getting your subject strategy right is the single most important move you can make.
Start with the free CSSNorthStar assessment →
Sheharyar Ahmad
Founder, CSSNorthstar
Sheharyar Ahmad graduated from LUMS with BSc. (Hons.) in 2010 and topped the CSS Exam 2012 on his first attempt. He is an officer of the Pakistan Administrative Service, having served in Gilgit-Baltistan, Punjab, and Federal governments. He was awarded the Fulbright Scholarship to pursue a Master in Public Policy and Data Analytics from USA in 2022.