Hi

Assuming that your question in regarding with UPSC civil services examination.

No, for Paper A i. e compulsory indian language, you can not attempt your paper ine English as it is not available for compulsory Indian language,   you need to answer this paper in the language you choose for this paper itself.

For paper A i. e compulsory indian language,  you can choose any one of the language which are there in 8th schedule of the Constitution listed below

-) Assamese

-) Bengali

-) Gujarati

-) Hindi

-) Kannada

-) Kashmiri

-) Konkani

-) Malayalam

-) Manipuri

-) Marathi

-) Nepali

-) Odia

-) Punjabi

-) Sanskrit

-) Sindhi

-) Tamil

-) Telugu

-) Urdu

-) Bodo

-) Dogri

-) Maithili

-) Santhali

If you are from the north-eastern states i.e Sikkim/ Arunachal Pradesh/Meghalaya, Manipur/Mizoram / Nagaland then you are exempted from  giving mains paper A i. e compulsory Indian language paper examination but yes to avail this exemption, you will have to upload  scanned copy of a document which supports that you hail from aforesaid north-eastern states, while submitting your Detailed Application Form i. e DAF for your 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.

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

https://competition.careers360.com/articles/upsc-ias-exam-pattern

Thank you