https://www.gov.uk/government/publications/sen-and-disability-duties-guidance-for-school-governing-boards/special-educational-needs-sen-and-disabilities-guidance-for-school-governing-boards#the-role-and-responsibilities-of-the-governing-board

Using the above link have a look at the latest DFE guidance for Governors to enable them to support SEND provision in their schools.

Will guide you to key questions to ask plus what you should be able to source from your school to be effective