Hello,
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You need to have the knowledge of MS WORD/ POWER POINT / EXCEL. These are the main things you will use as HR. Now, being a b.com/ bba / ca student will help you in being a HR.
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Atleast you need to have the knowledge of managing the accounts of the colleagues you work with and look at there work.
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What your colleagues do? They will manage the customers and you need to manage them as well as company