If you studied geology, geophysics, chemistry, or hydrogeology and have been quietly waiting for the right government exam to come along, this is probably it. UPSC has just released the notification for the Combined Geo-Scientist Examination (CGSE) 2027, and it's opened up 127 tentative vacancies — a genuinely big number for a specialised scientific exam like this one.
This isn't some minor recruitment notice buried on a website somewhere either. CGSE is one of UPSC's flagship science exams, and it feeds directly into two heavyweight government bodies: the Geological Survey of India (which sits under the Ministry of Mines) and the Central Ground Water Board (under the Ministry of Jal Shakti).
So What Exactly Is This Exam?
Put simply, CGSE is how the government recruits its scientific officers — Geologists, Geophysicists, Chemists, Hydrogeologists — into some of India's most important earth-science institutions. If you've spent your postgrad years digging into mineral exploration, groundwater systems, or geochemistry, roles like this don't come around often, and when they do, they're worth taking seriously.
Where Would You Actually End Up Working?
The 127 posts are split into two buckets:
Geological Survey of India — 111 posts. This is the bigger chunk by far. It covers Geologist, Geophysicist and Chemist positions at the Group A level, plus Assistant Geologist, Assistant Geophysicist and Assistant Chemist at Group B.
Central Ground Water Board — 16 posts. Smaller, but still solid if groundwater science is more your world. Think Scientist 'B' roles in Hydrogeology, Chemistry and Geophysics streams, along with a handful of Assistant-level posts.
The nice part is you don't have to pick just one. A single application and a single fee can cover both categories, so if you're eligible for roles in each, there's no reason not to apply to both.
Who's Actually Eligible?
You'll need a Master's degree, but which one exactly depends on the post you're aiming for:
Going for Geologist? You'll need a Master's in Geology, Applied Geology, Mineral Exploration, Petroleum Geosciences, or something in that family.
Geophysicist roles want an M.Sc. in Physics, Applied Physics, or Geophysics.
Chemist posts need an M.Sc. in Chemistry — organic, inorganic, analytical, physical, industrial, any of those count.
Hydrogeology positions specifically need a master's in Geology, Applied Geology, or Hydrogeology.
And if you're still waiting on your final semester results, don't let that stop you from applying — you'll just need to show proof of passing before you get to the interview stage.
As for age, you need to fall between 21 and 32 years as of 1 January 2027. That works out to being born somewhere between 2 January 1995 and 1 January 2006. The usual relaxations apply on top of that — a few extra years for SC/ST and OBC candidates, more for PwBD applicants and ex-servicemen, and some leeway for anyone already working within GSI or CGWB.
What Will It Cost You to Apply?
The fee is a flat ₹200. Female candidates and anyone from SC/ST or PwBD categories don't have to pay anything at all. If you fall under OBC or EWS, you'll need to pay the full amount — and once it's paid, there's no getting it back, so it's worth being sure of your eligibility before you go ahead and submit.
How the Whole Selection Process Plays Out
This is a three-stage exam, and it's worth knowing the full shape of it before you start preparing, not just the part that's open right now:
First comes the Preliminary Examination — objective type, 400 marks, scheduled for 10 January 2027. Clear that, and you move to the Main Examination — descriptive this time, worth 600 marks, spread across 19 and 20 June 2027. After that comes the Personality Test, worth 200 marks, which is the last hurdle before the final merit list.
One thing worth flagging: your Prelims score isn't just a qualifying cutoff you forget about once you clear it. It actually gets added to your Mains score for the final ranking, so it's genuinely worth taking seriously rather than just scraping through. Also worth noting — this particular notification is only for registering for the Prelims. Making it through that gets you into the Mains process separately, later.
Exam Centres
The Prelims will be conducted across 21 cities, including Delhi, Mumbai, Chennai, Kolkata, Bengaluru, Hyderabad, Bhopal, Jaipur and Lucknow, among others. Seats at most centres are capped and allotted on a first-come basis (a few big cities are the exception), so if you have a preferred centre, applying early actually helps.
Documents You'll Want Sorted in Advance
Before you sit down to fill the form, it helps to have all of this ready rather than scrambling midway:
Aadhaar Card, ideally — though Voter ID, PAN, Passport or Driving Licence work too
Your matriculation certificate, for date-of-birth proof
Master's degree certificate and mark sheets
Category certificate, if you're applying under a reserved category
A properly sized photograph and signature for upload
Applying, Step by Step
Go to the UPSC application portal and register to get a Universal Registration Number (URN) — this is a one-time thing that stays valid across every future UPSC exam you apply for.
Fill in the Common Application Form, which is shared across UPSC exams.
Complete the CGSE-specific section — this is where you pick your exam centre and pay the fee.
Upload your photo and signature in the format they ask for.
Submit before the deadline. There's no walking this back once it's in — apart from a limited one-time profile correction that doesn't touch applications you've already submitted.
It's all online. There's no offline or postal route for this one, so don't bother printing forms or mailing anything in.
A Few Practical Things to Know Before Exam Day
Mobiles, smart watches, Bluetooth devices — none of it gets past the gate, even switched off.
Entry closes 30 minutes before each session, and there's genuinely no flexibility if you're late.
Bring a black ball pen. Pencils and ink pens aren't allowed for the OMR sheet.
There's negative marking in the Prelims, so guessing blindly can actually cost you.
Admit cards go up online only, in the week before the exam. Nothing arrives by post.
Is It Actually Worth Applying?
Beyond the obvious appeal of a stable government post, this is genuinely meaningful work — mineral surveys, groundwater assessment, geological mapping, the kind of research that quietly shapes how India manages its natural resources. If you've put years into building expertise in earth sciences, this is a very different track from private research or academia, and for a lot of people, that's exactly the point.