Isn't that the general knowledge exam for entrance into PS?
It isn't studiable
(is that a word?) it is more a tool to assess a person. If it is the one I am thinking of, it just is pretty straight forward, nothing to get stressed about. you either have it or don't. It has logic tests and straightforward math questions.
here it is:
The EPSAT is designed to assess your aptitude in the fields of engineering and physical science. It consists of six sections: three parts on mathematics, one part on general science, one part on vocabulary and one part on mechanical comprehension.