You'd have to find out if the school is accredited.
It does say, though, that you need 51 months of work experience, and that you MAY be eligible to take the NCLEX- so it sounds shady. Or maybe its different in every state, and in some you could take the LVN exam, in others maybe not. Here in MN, i dont think we have LVN, only LPN, dont know if thats a difference or not.
There are lists out there on the web of unaccredited schools and universities- just do a google search for "diploma mill" or "degree mill"- if this school is on any of those lists, beware ;-)