He takes them as part of his physicals. Trump and Biden should be carted off to a medical facility and they should both take extreme physicals and the public should get all the results.
The fact that Trump bragged about "acing" the mental part of the geriatric physicals tells you all you need to know, They are, by design. very easy. They are looking for problems that may indicate beginning age-related mental conditions. Trump bragging about it is like him passing the 8th grade. Any normal person can walk through those tests. I guess Trump was sure he would fail. He may have. You do not get the truth from him.