Go to the library & get one of the testing books. It does not necessarily have to be a nursing test book. But, it would be great if could get your hands on one.
It can even be like a SAT, ASVAB, etc.
Just as long as it has the basic test stuff like math, comprehension,science,etc.
Practice the problems & study it.
Also, I don't know if you still have to write an essay anymore or not.
But, just practice writing small essays.
You should do fine.