@kratkale Like I said, if you know which nvme drive has the student data, and which is expected to be the OS:
On a registered host you can explicitly call out which drive using “serial, wwn” or otherwise.
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You type in the wwn or serial number: lsblk -pdno PATH,SERIAL,WWN,SIZE --nvme respective of your device. (I lowercase them for simplicity.)
Find your “primary” drive, and put in either one of those details in the form field and give it a shot. It should work and will leave the other drive completely alone so long as the type of image you’re using is “single disk” style.