what is then end goal of a brains training exercise? why might time only tell if the exercises work? springboard

Here hope this helps.

Explanation:

Mental abilities that tend to decrease with age include processing speed, reaction time, decision making, short-term memory, and planning skills. Brain training may be helpful for sharpening these abilities, and it may help reduce the risks of some age-related memory problems.

in my opinion, ap calculus was the most difficult. i often struggled with it a lot. however, i have gotten a lot better.