See also, the page specific to A Level which includes a file of resources mapped to the A Level content.
With outstanding free resources such as GeoGebra, WolframAlpha and Desmos which are also available as apps for tablets and phones as well as desktop versions we can easily illustrate concepts in our day to day lessons. Also note Graspable Math.
For older students we quite rightly have the Use of Technology as a requiremnet of the course, something that we should be using all the time, not just occasionally. We need to make sure we are using technology for learning for all our students.
Will Hornby of OCR has written very clearly on calculators in The truth about calculators for Maths A Levels (March 2020). Will has referred to JCQ instructions for conducting examinations, making this article relevant whichever exam board you use.
For excellent advice on the use of Technology, see these MEI pages. Note MEI’s comprehensive guidance with ideas for integrating Technology which I think will be useful whichever examination board you are using.
From Edexcel comes this helpful guide with links to numerous GeoGebra files:
A Guide to using GeoGebra when teaching AS and A Level Mathematics.
Further GeoGebra resources are discussed in this post.
You can find an excellent calculator guide for the Casio FX991EX-ClassWiz on Dr Frost’s site.