I can't speak of the package (maybe you should put a link in your post), but it may be worth studying with free resources first, to see how you get on.
If you want some ideas, here is the study plan I wrote and work to:
http://becomingachessmaster.com/study-plan/
I am an unrated player and can someone advise whether the GRANDMASTER package offered by International Chess School website could bring me lot of value to improve my game please?