If you want to become an IAS officer, you should write UPSC exam. You can become a graduate in any discipline to write UPSC exam. So B.Tech is also acceptable degree. UPSC exam is done in 2 phases namely prelims and mains. Those who qualify in prelims will write mains exams. Those who are selected in mains will appear for Final interview. Prelims is a pen and paper based objective type question paper. Mains is a written exam with subjective type of questions. Interview is a personality test. Check this page for more details: https://competition.careers360.com/articles/upsc-ias
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