🇱🇰 Sri Lanka: GCE A-Level Z-Score Prediction Engine
Estimate the UGC Z-Score used for state-funded university admission in Sri Lanka: Z = (Z1 + Z2 + Z3) / 3, with the 40% all-island merit, 55% district quota and 5% educationally disadvantaged district lanes.
Final Z-Score
How the Sri Lanka Z-Score Works
The standardisation formula. For each of the three A/L subjects the UGC computes Zi = (Xi − μi) / σi, where Xi is your raw mark, μi is the island-wide mean for that subject and σi is the island-wide standard deviation. The final score used for university selection is the simple average Z = (Z1 + Z2 + Z3) / 3. Because each subject's marks are pulled to a mean of 0 and SD of 1, candidates sitting harder papers are not penalised relative to softer ones.
Three-pass eligibility gate. A Z-score is only valid for university selection if the candidate has obtained at least an "S" pass (raw mark of 30 or more out of 100) in all three A/L subjects in the same sitting and at least 30 in the Common General Test. This calculator enforces that triple-gate lock: failing any one of the four floors collapses the result to "ineligible" even when the headline Z-score is positive.
The 40 / 55 / 5 quota partition. Once eligibility is established, seats at every state university course are filled in three lanes: 40% on all-island merit from the raw Z-score rank order, 55% on district merit proportionally allocated to all 25 districts using population and resource weights, and 5% on the educationally disadvantaged districts quota reserved for 16 specified districts. A higher Z-score competes more strongly in the merit lane; a candidate in a disadvantaged district benefits from both the district and 5% lanes.
The regulatory trap. A common error is to compute the Z-score against the candidate's own school cohort or stream average, not the island-wide subject mean μ and SD σ published by the Department of Examinations. The Z formula is normalised per subject across all candidates who sat that subject in that sitting, never per school or stream. Another trap is averaging four Z-scores when the student sat a fourth optional subject — the UGC takes the best three subjects only after the per-subject Z is computed.
Primary sources. Refer to the University Grants Commission of Sri Lanka (ugc.ac.lk) for the binding annual Admission Handbook (COP) and Z-score cut-off tables by course and district, and the Department of Examinations, Sri Lanka (doenets.lk) for the official subject means, standard deviations and raw mark scales used in each year's standardisation.
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