The NCLEX uses same language for every candidate. NCLEX makes sure that terminology used in exam questions have only one meaning. NCLEX knows that most nurses are more familiar with brand/trade names when referring to medications. We know tylenol better than acetaminophen, Motrin is more familiar than ibuprofen. Tamiflu is easy to understand than Oseltamivir.
However, trade names may not be there in your NCLEX exam. At this time, the NCLEX will resort to, on most occasions, the use of generic medication names. NCLEX knows that the use of it is more consistent because a brand/trade medication name may vary. So it is important for candidates preparing for NCLEX to learn the generic name of medications.