My German student visa starts on the 1st of March. My studies start from the 1st of April. I will receive my Immatrikulationsbescheinigung after 15th of March. My question is: Can I work as a student before the 1st of April? My Insurance starts on the 1st of April as well, but there is an option to ask insurance company to makethe start date earlier as a non-student. I am not an EU citizen.