Dear Student ,
After graduation , you have to appear for UPSC CSE exam to become a collector .Every year UPSC releases the notification in their website to apply for this exam .
So, study hard and keep aware about the latest updates by visiting regularly in UPSC official portal.
To know more about this exam , you may refer to this link also :
https://competition.careers360.com/exams/upsc-civil-services-exam
Hope this helps !
Best wishes !!
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