You can complete the Duolingo English Test even if you do not have a valid passport.
When selecting "Syria" as your country, you will see that "passport" is the only form of ID listed. Even so, proceed with taking a photo of the ID you have (i.e. your national ID).
If Duolingo does not accept your national ID, go back to the question about your country and select "United Nations" instead. Then, try taking a photo of your ID again.
If this does not work, please reach out to us at applications@sye-initiative.org no later than May 12.