Not affiliated with psychology in any way, so my knowledge is essentially zero. I am looking for a way to measure change in my ability to focus during a fast. This is simply for a personal experiment. I had a look online and could not find a standardised tests used in research.
Any help in finding one is appreciated. Thanks
EDIT: edited to clarify that I am not looking for life advice. I am looking for a standardized test used in psychology research to measure my ability to focus (concentration a task?).