This is a collection of downloadable self-help guides that we really like and hope may be useful to you. Some are aimed at adults but the ideas and suggestions in them can still be relevant for young people and parents. If you click on the image it will automatically download the PDF from its source and the credit will link to the originators main website.
https://www.camhs-resources.co.uk/downloads
NHS
https://www.nhs.uk/conditions/stress-anxiety-depression/anxiety-in-children/
Childline
Young Minds
Unicef