Hey!
To become a police officer minimum age limit is 21 years. If you are targeting for IPS or IAS then you need to qualify civil crevices exam (UPSC) and there are state level exam also which as conducted by SSC to recruit police constables. In any exam there re mainly 3 rounds which you need to qualify : prelims, mains and interview. Also, you need to have proper wight, height or any other measurements which are required for recruitment. For more information regarding same, kindly visit the link given below
https://www.google.com/amp/s/school.careers360.com/articles/career-as-police-officer/amp
Good Luck
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