I know those review courses do not seem worthwhile. I personally felt the same way you do. But I took one offered by my school as a class and I drastically improved, in just 15 weeks I went from a 16 percentile in my class to a 54percentile. My advice, is take more of them, and practice 250-500 nclex questions a day, and review the rationale for those that you get wrong, good luck...