Thankfully I did PSA4 in January and have PSA 5 tomorrow. When revising do you just cover the points summarised at the end of the chapter, because especially with the star unit, there is tonnes in the chapter not covered by the summary points....and looking over past papers they sometimes ask stuff not covered in the bullet points. e.g. physics principles behind improving acoustics in concert halls..its in the chapter but not in the summary. I'm just worried they will ask stuff I haven't revised.