Hello,

According to notice released by CBSE regarding the submission of forms by Private Candidates,

The compartment option is available for Private Candidates also.

In your marksheet of the main exam, you will be declared as "Compartment" in the concerned subject. (in your case, physics).

If that is the case, you can also reappear for the exam in the month of May (tentative).

Information regarding form fillup and other proceedings are also available in the Notice.

Link to the CBSE Notice:

http://cbse.nic.in/newsite/private/Submission%20of%20Examination%20forms%20by%20Private%20Candidates%20for%20Class%20XII%202020.pdf

Hope this helps.

Thanks.