Read this article from Young Minds to support child with returning to school: https://youngminds.org.uk/blog/supporting-a-child-returning-to-school-after-lockdown/

If you are concerned, worried or need further support please contact your child's class teacher and we will support you as much as we can. We realised that this is an incredibly anxious time but we are here to help. It is really important to establish a routine  During lockdown it is understandable that your family’s routine may have changed. Children are likely to have been waking up later or going to bed later. To help them get ready for school, try to gradually get them back into their usual morning and bedtime routines as they get closer to their return date. and beyond.