i will make a point here: no one should be allowed inside a Mathematics program if he can't count all the leaves in a given tree and the number of birds in a flock (assuming he is not blind of course, if he is, he doesn't need this test)

We live in a period where counting and mental arithmetics are seem as unnecessary. Of course it is seem that way, people can't do it, how could they see its benefits? I am here to tell you about them

>The science of numbers and the art of calculation depend upon pure intelligence in the attainment of pure truth.
>Indeed, it most certainly does that.
>Have you noticed, too, how people with a talent for calculation are generally quick at every other kind of knowledge; and how training in it makes a slow mind quicker than it would otherwise have been?
>I have.
>Also, it would not be easy to find many branches of study that require more effort from the learner. For all these reasons we cannot do without this form of training.
Plato, The Republic, Book VII

Intelligence is the most essential human atribute, it consists on the capacity of aprehending the truth, that is, recognizing something is true
https://archived.moe/lit/thread/16639317/

Counting and mental arithmetics not only train important mental abilities like speed of reasoning, attention, memory, but also, intelligence, as every time you count you are exercising your intelligence as you are aprehending a truth so simple it cannot be denied.

Everyone that completes the "training" described in the first few chapters of the book in the picture will be prepared for a great career in Mathematics or any other field that require intelligence.

Start slowly, count the least of things, count 1 bird, 2 birds flying. Observe people, count them, add one by one in your mind. You will have a lot of fun and you will surprise yourself with you capabilities.