Hello,

Yes, you can write the session 1 exam even if your 12th mark sheet was not uploaded during the BIT SAT application . Usually, not uploading the mark sheet at the time of registration does not stop you from appearing in the exam.

Just make sure to upload the required documents before the final admission process or as instructed by the exam authority.

If you want to be completely sure, you can check with the BIT SAT help desk or their official website for any specific rules about this. But generally, there is no objection for writing the session 1 exam in this case.

Hope it helps !