Alerts and Updates for UPSC Combined Geo-Scientist Examination

The preliminary stage is objective and screening only: its 400 marks decide who sits the main examination and then drop out of the reckoning entirely, so the final merit is built on the 600-mark descriptive main plus the 200-mark interview. Each stream sits its own Paper II at prelims and its own three descriptive papers at mains, at M.Sc. level, which means a Geophysics candidate and a Chemistry candidate compete on entirely different question papers and against separate vacancy pools. FreeJobAlert describes the prelims as objective with two papers per stream and the main examination as conventional or descriptive with three papers per stream, and puts the application fee at Rs 200 with women, SC, ST and PwBD candidates exempt. The qualification for every stream is a master's degree in the relevant discipline.

The 2027 prelims and mains dates appear both in the UPSC annual examination calendar released on 20 May 2026 and in the notification of 2 September 2026, which is why they are shown as confirmed rather than tentative. UPSC nonetheless reserves the right in the calendar to alter dates of notification, commencement and duration.

Candidates routinely treat Combined Geo-Scientist as one examination with four flavours. It is closer to four separate examinations sharing a common General Studies paper, a common calendar and a common interview board. You choose one stream at application, you sit only that stream's papers, and you are ranked only against the vacancies in that stream. Choosing the stream on the basis of which one looks less crowded, rather than which M.Sc. you actually hold, is the most expensive mistake available at the form stage.

The 2027 vacancy table makes the asymmetry plain. Geology-side posts dominate: 29 Geologist and 34 Assistant Geologist at GSI, against 7 Chemist and 6 Assistant Chemist. Geophysics carries 35 Assistant Geophysicist posts at GSI plus one at CGWB, and the hydrogeology route offers 5 Scientist B and 7 Assistant Hydrogeologist posts at the Central Ground Water Board. A stream with more posts is not automatically easier, because the candidate pool scales with the discipline's graduate output, but a stream with a single vacancy, as with Scientist B Chemical and Scientist B Geophysics at CGWB, effectively demands a top-of-list performance. Read the table before deciding, and note that FreeJobAlert describes the 127 figure as tentative, which means it can move before the final result.

The preliminary examination is 400 marks, made up of a 100-mark General Studies paper common to all streams and a 300-mark stream paper, both objective and both two hours. Those 400 marks buy nothing but a seat at the main examination. Final merit is drawn on the 600-mark descriptive main plus the 200-mark interview, a total of 800. The practical consequence is that time spent chasing a very high prelims score past the qualifying threshold is time not spent on writing practice for three conventional papers, which is where the ranking is actually made. Because the prelims stream paper carries three times the weight of General Studies within that screening stage, the efficient allocation at the January stage is heavily towards the subject, with General Studies treated as a floor to clear.

Each stream sits three conventional papers at M.Sc. level for 600 marks combined, spread over 19 and 20 June 2027. Conventional means written answers, derivations, labelled diagrams and, in the geology and geophysics streams, numerical work under time pressure. Candidates arriving from an objective-test preparation background frequently have the content and still lose marks on presentation and on failing to finish. The gap between a 2026 prelims qualification and a 2027 main paper for anyone carrying both cycles is also a scheduling problem in its own right. Build answer-writing into the routine from the prelims stage rather than after 10 January 2027, because five months is not long to convert recognition-level knowledge into production-level knowledge across three papers.

At 200 marks against a 600-mark main, the personality test is a quarter of the 800-mark merit total. That is a higher share than in the Engineering Services Examination, where the interview is 200 of 1,300, and higher than in the Civil Services Examination. Prepp's reported 2025 figures illustrate how far scores travel between stages: for the general category it lists Geologist at 175 at prelims, 458 at mains and 599 at the final stage, Chemist at 167, 530 and 791, and Geophysicist at 131, 369 and 566. Those numbers are coaching-site figures rather than a UPSC document we could open, and the stages they refer to are on different maxima, so use them for the shape of the gaps rather than as targets.

The qualification requirement is a master's degree in the relevant discipline: Geology or Applied Geology for the geologist posts, M.Sc. Physics or Geophysics for geophysics, M.Sc. Chemistry for the chemist posts, and M.Sc. Hydrogeology for the hydrogeology route, as reported by FreeJobAlert. The age position is less settled in the sources reachable here. FreeJobAlert gives 21 to 32 years as on 1 January 2027, with a birth-date band of 2 January 1995 to 1 January 2006 and relaxations up to five years; Prepp gives 21 to 30 for the general category. Combined Geo-Scientist has no reported cap on attempts, so the age ceiling is the binding constraint. Since limits differ by post, verify against the notification's own table.