Academic writing guide?

Does anyone have any recommendations for a guide on how to academic writing?

My sister, as her school's SENCO*, has to do a masters level Postgraduate Certificate in SEND*  (it's a legal requirement of the job), but the guidance she's had is pretty poor, roughly "Academic writing is very different, don't use first or second person and reference everything". Sadly I'm not exaggerating how skimpy it is - I read through it on Sunday morning in under 10 minutes, though it takes a couple of pages to say what I've reduced to a sentence. (I suspect they just haven't taken account of how unsupported people are when everything's being done remotely - three online days to date - and they haven't done academic work in several decades).

Obviously a slightly more useful guide might help her get a better idea of what's expected of her. So is there anything out there? It doesn't have to be subject specific, just cover academic writing in a more useful format.

* Special Educational Needs Coordinator

** Special Educational Needs and Development