Scirion Institute of Exercise Physiology certification??

[fitness_guru]

Hi...I have been offered a career at Scirion and have to take the exam before I am "officially" hired. I have heard it is pretty difficult but I am debating as to whether I should purchase the study material since I just finished my B.S. degree in Exercise Science. Can anyone advise me as to whether I should purchase these materials or whether my exercise physiology and nutrition textbooks would suffice?

Thanks!!