Hello,
While applying for CDSE exam, you will not be asked for original marksheet. So, there will not be any problem.
However after clearing the written examination when you will be called for the SSB interview, you will be asked to produce orignal documents for verification.
So it will be best to get your orignal documents reissued.
Contact the regional head office of your respective board, they will guide you for the further process. Usually it taked 15-20 days to get your original marksheet re issued.

Good luck

Combined Defence Services Examination

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