CPC training online and other questions

The amount of people i have come across who having done the drivers hours course, still don’t understand it, some could do with taking it twice.
A chap at our place just can’t grasp the 24 hour rule, he’s done the drivers hrs twice. He keeps getting infringements for it. I’ve tried myself to explain it to him, he just ain’t grasping it.
Employer just keeps saying sign for your infringements here…!
When DVSA have him for it he’ll take notice…