When the gender hasn't been identified, "they/their/them" must be applied instead of his/her him/her, such as your example, see:
Everyone applying for scholarship has to fill the form. He/She must also provide his/her result card with his/her form.
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Everyone applying for scholarship has to fill the form. They must also provide their result card with their form.
As "Everyone" is a non-identified gender, but it is considered singular, it explains the usage of "has", but if you answer goes along you will probably face the need of using non-identified genders, that's where "They/them/their" fit.
But, if you are telling a story, such as someone looking at your girlfriend or boyfriend, and you know who you were talking about, you could say: The last week's party was awesome, but there were some guys looking at my friend, she got really mad and left the party
"friend" is a non-identified gender, but it can easily be identified after you increased the "she", which implies to say that your friend was female.
Would "Applicants must also provide their result cards with their forms" be okay? – Drossel – 2017-01-04T10:24:15.657
@Drossel yes, it definitely would be okay... But as I said, I am basically looking for an alternative word for he/she and his/her. Just took the above sentence as an example. – Hassan Ashas – 2017-01-04T10:25:18.980
You could also use the singular they. – Abbasi – 2017-01-04T11:04:33.567