how easy/hard the test is really depends on 2 things: how bright you are and how prepared you are. i consider myself pretty bright, and i was prepared, i only missed like 4 questions. for some, the test is impossible, for the majority, its hard but doable.
if you dont already have the tan nln review book get it. you dont have much time, so start absorbing everything in there.
as far as the english part, either you know the words or you dont. review some roots, stems, etc.
math: review decimals, percents, geometry, algebra, division and mult. with decimals, stuff like that
science: review A&P, bio, micro, and physics.
if i can be of any further help, let me know.