Additional websites that I have used are below:
https://sites.google.com/view/tlmaths/home/a-level-maths/as-only?authuser=0
https://sites.google.com/view/mathematics-videos-geogebra/home/a-level-year-1?authuser=
https://www.youtube.com/@BicenMaths/playlists
https://www.drfrostmaths.com/sow.php?year=A%20Level%202017&term=Main
https://amsp.org.uk/teachers/a-level-mathematics/resources/
https://www.resourceaholic.com/p/year-12.html
https://www.resourceaholic.com/p/statistics.html
https://www.resourceaholic.com/p/mechanics.html
https://www.physicsandmathstutor.com/maths-revision/a-level-edexcel/
https://undergroundmathematics.org/
https://mrsouthernmaths.wordpress.com/about/
https://www.draustinmaths.com/
https://www.savemyexams.co.uk/a-level/maths_pure/edexcel/18/revision-notes/
https://mmerevise.co.uk/a-level-maths-revision/edexcel/
https://susanrwhitehouse.wixsite.com/maths/resources
https://www.jethwamaths.com/pure-1---worksheets-and-tests.html
https://www.tes.com/teaching-resource/a-level-pure-maths-knowledge-organisers-12343536
https://www.tes.com/teaching-resource/edexcel-a-level-statistics-knowledge-organisers-12342433
https://www.tes.com/teaching-resource/edexcel-a-level-mechanics-knowledge-organisers-12344261
https://corbettmaths.com/more/corbetts-conundrums/
https://b28mathstutor.co.uk/clueless-about-calculators/
https://education.casio.co.uk/calculators/classwiz-product-range/
Calculator guide (Mech): https://www.youtube.com/watch?v=gSJ4SCFrDlc&list=PLd7FwnU6nvjFY9Kb3ooSpYNrk8EUiV22P