Hey I have talked with an admission professor from Cambridge and also some students studying biological Natsci at Cambridge and they all told me that the NSAA was just a simple exam testing basic AS level knowledge and that it was only intended to eliminate weak candidates. They told me about 70-80% of candidates who take the test were admitted and that much preparation wasn't actually necessary for the test.
Does anyone have any info about the NSAA? Have you guys heard the same?