Edexcel A level biology: why do they always include content that is out of spec??

Hi, I am studying edexcel SNAB biology and what I am confused about is how edexcel is able to assess content that isn't in the specification... I see exam questions that are not application based and I do not see any spec points that correlate to the question. Is there like a different spec that someone may of have made to show the content that we actually need to know and not edexcels rubbish spec?