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You need to give Union Public Service Commission (UPSC). The recruitment of candidates to Indian Administrative Service (IAS), Indian Foreign Service (IFS) , Indian Police Service, Indian Revenue Service (IRS) is done through this exam only.
UPSC Civil Services Syllabus for Preliminary Exam-
Paper I – General Studies-
Current events of national and international importance
History of India and Indian National Movement
Indian and World Geography - Physical, Social, Economic Geography of India and the World
Indian Polity and Governance - Constitution, Political System, Panchayati Raj, Public Policy Rights Issues, etc
Economic and Social Development - Sustainable Development, Poverty, Inclusion, Demographics, Social Sector initiatives, etc
General issues on Environmental Ecology, Bio-diversity and Climate Change - that do not require subject specialization
General Science
Paper II – General Studies
Comprehension
Interpersonal skills including communication skills
Logical reasoning and analytical ability
Decision-making and problem solving
General mental ability
Basic numeracy (numbers and their relations, orders of magnitude etc.) (Class X level), Data interpretation (charts, graphs, tables, data sufficiency etc. Class X level) .
All the best.
Syllabus for entrance exam for IFS which is UPSC is hsared below.
https://university.careers360.com/articles/exam-indian-forest-services
https://competition.careers360.com/articles/upsc-civil-services-exam-pattern-syllabus
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