What should someone with ADD and ADHD do in order to sustain proper focus?

My friend has ADHD and she has to take certain medication to be able to keep focus on what she is doing which can be hard for her but something that she does to keep focus on her homework she goes to the library turns her phone upside down and turns off her ringtone expect for her parents and just spends time doing her homework it does a bit longer but that is just the way that best suits her, she also needs to make sure she eats a good breakfast which her mom makes for her everyday.

Explanation:

the hyperactive and edgy feeling that comes when there is too much sugar in the blood stream. the actual amount of food that is eaten in a single meal. food with a high glycemic index is digested slowly.

true.