Shubham, IAS recruitment is through UPSC examination and UPSC is held at 3 stages. Prelims, Mains and Final Round of Interview.
UPSC Prelims has 2 papers. Paper 1 covers Current Events, History of India and Indian National Movement, Indian and World Geography, Indian Polity and Governance, Economic and Social Development, General Issues on Environmental ecology, General Science.
Paper 2 covers Comprehension, Interpersonal skills including communication skills, logical reasoning and analytical ability, decision making and problem solving, General Mental Ability and basic numeracy numbers.
If you look at the topics, these are based on what you have studied in your 10th and 12th. So while studying B.Tech, you also have to study your 10th and 12th books for Paper 1. And for Paper 2 which is CSAT, you might have to take up coaching because that way you learn the short cuts and can effectively solve the questions. For tips to read our article: https://competition.careers360.com/articles/how-prepare-for-upsc-ias
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