I want to do STEP I/II but would also like to do STEP III. how possible is that and would the work load be 2 much? Im currently going through the siklos book and am having a good go at the majority of the questions
I recommend doing STEP papers in turn. I've not gone beyond II yet but I got a 1 in that... so I'm quietly confident about STEP III, at least for a reasonable 'pass'.
Each paper takes 3 hours. I feel sorry for an invigilator having to wait around for 6 hours, not to mention the ridiculous burden it will place on you. If you want a "safe" bet, then do I. If you want to push yourself then do III. Simples
I think when it was run by OCR it was allowed but discouraged, but Cambridge assessment (who run it now) do not allow people to be entered for all 3 papers. Just do I, II and the AEA if you're trying to meet a Warwick offer.