No, they cannot attend non-school providers under current restrictions*.
*Except under specific conditions as outlined on the Victorian Curriculum and Assessment Authority website. In conducting Essential Assessments onsite for Unit 3 and 4 VCE and VCAL, all providers must follow all COVID-19 related Health directions and Department of Education and Training guidelines as well as Specific controls for Essential Assessments for VCE and VCAL approved by the Department of Health and Human Services. In this document scroll down to the last row in the table for greater detail.