What is the qualifying nature of the language papers in UPSC Mains?

The Language Papers in UPSC Mains, designated as Paper A (Indian Language) and Paper B (English), serve as mandatory qualifying hurdles.
Each paper is worth 300 marks, and candidates must secure a minimum of 25% (75 marks) to pass.
Their primary purpose is to ensure that future civil servants possess a functional command of English and at least one Indian language.
The standard of these exams is equivalent to Class X (Matriculation), covering tasks like essay writing, précis writing, reading comprehension, and basic grammar.
While the marks from these papers are not counted toward the final merit list, they are of critical importance.
The UPSC evaluates the language papers first; if a candidate fails to meet the 25% threshold in either, their remaining seven merit papers (Essay, General Studies, and Optional) will not be evaluated at all. This results in immediate disqualification from the race.
Notably, certain exemptions apply: candidates from North-Eastern states like Meghalaya, Mizoram, Manipur, Nagaland, Arunachal Pradesh, and Sikkim are not required to take the Indian Language paper.