Hi

The UPSC Prelims ( objective ) and Mains (written) examination question paper are set in both English and Hindi except the language papers . One has  the option to write  answers in English  or in any one of the Eighth Schedule languages  which consists of  22 languages  listed below:-

-) Assamese

-) Bengali

-) Gujarati

-) Hindi

-) Kannada

-) Kashmiri

-) Konkani

-) Malayalam

-) Manipuri

-) Marathi

-) Nepali

-) Odia

-) Punjabi

-) Sanskrit

-) Sindhi

-) Tamil

-) Telugu

-) Urdu

-) Bodo

-) Dogri

-) Maithili

-) Santhali

So, yes you can definitely write all your GS papers in Gujarati in UPSC Mains examination

To help you for further, here's a brief of UPSC examination pattern

UPSC civil services examination  has 3 stages listed below :-

*prelims exam :- it is objective paper and is of qualifying nature , so you just  need to at least qualify it to be eligible for mains examination, the score /marks obtained by you in your prelims examination is not added up or used in your final merit. Your prelims exam consist of 2 papers: -

-) general studies 1

-) general studies II ( csat )

You get 2 hours for each paper

*Mains exam. :- it is descriptive /written examination . There are a total of 9 papers  which are listed below:-

-) paper A :- compulsory indian language.

-) paper B :- english

-) essay

-) general studies I

-) general studies II

-) general studies III

-) general studies IV

-) optional I

-) optional II

The compulsory indian language and english are qualifying in nature . You just need to qualify them. The marks obtained by you in these two papers will not be counted towards merit list.

*Interview :- After qualifying mains, you have to go through interview round, and it is more of test of your personality rather than knowledge.

So, if you managed to sail through all the three stages  then congratulations you can become an ias  officer depending upon  rank obtained by you in UPSC civil services examination ,your preference of services and your category .

For detailed information , I will recommend you to go through our page the link for the same is provided below

https://school.careers360.com/articles/how-to-become-an-ias-officer

If you have any other doubt then feel free to ask them :) we are always here to help you out and guide you

Thank you