Hi,
You may take AZ-305 exam without pre-requisite, however, even if you pass you will not earn certification until you also obtain Microsoft Certified: Azure Administrator Associate (AZ-104). Typically people pass the pre-requisite AZ-104 exam first and then take AZ-305.
https://learn.microsoft.com/en-us/certifications/azure-solutions-architect/
Please click Accept Answer if the above was useful.
Thanks.
-TP