Questions about LPN program?

this ? is 4 all the LPNs and RNs. I just started an LPN program. Although I'm starting off well, I have some concerns about the testing. I notice a lot of times we r marked wrong for an answer that is right according to the book and the "NCLEX style questions" that r on the CD that came with the book. We bring it up to the instructor, sometimes he gives points back, but sometimes he won't. I've looked all over the web 4 info 2 help prove my point, but no luck. He says that the book is just a guide and NCLEX doesn't recognize one book over another & we just need 2 go by what he says. My problem is, that if NCLEX wants the answers the way they r on the CD/book, I don't think it's fair 2 reinforce a different answer. Example:once a lpn is licensed s/he can apply to another state 4 licensure by:a.taking ncelx 4 that state. b.interstate compact c.endorsment d.following the NursePracticeAct. the book/CD say C. endorsement,but he says B. interstate compact. where can i find proof?