Hello,
.
Inform in the college you are studying/studied that you lost your hall ticket.
They will provide you the copy of hall ticket.
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If you are good in cyber world, you can take it over internet by yourself.
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Type your class , institute name and the year  and search and find it.
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If not just inform in the institute and take it from institute.
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But be careful with educational issues they are complicated.

Thank you