Coaching for exam revision

Revision coaching: anyone tried online coaching or similar for exam time? Not yet diagnosed but v likely ASD/ADHD daughter really struggles with executive functioning ie planning and initiating tasks and I’m starting to worry about GCSEs next year. She’s bright and so far that’s got her by but I’m finding it hard to know how to help her with this and hiding my frustration that she can’t “just sit down and do some work”. would appreciate any advice.