Do study throughout not just before exams, you want to understand as well as remember, short burst learning tends to stick for a limited time only.
Presume this is ICAEW of which I know nothing re content/format but as nobody else has answered I offer my ten pence worth which will likely be nonsense from the perspective of the actual exams you are sitting, hopefully someone who has taken the exams will come along and correct everything following.
The old ICAS exams from the 1980s needed answers structured and framed as the Institute expected, knowing the subject was not enough, and doing a memory dump on paper was a very bad idea; the bit I found difficult post university was making the answers short, sweet and on point, no rambling essays (Literary flair needed curtailed) so you need to unlearn the approach you adopted at university. The way to get answers that were fit for purpose was to try lots of questions and look carefully at the model answers (assuming these are narrative exams and not multiple choice or similar, as I said no idea how ICAEW tests these two subjects) Practise, practise more practise.
Now I cannot comment on Tax Compliance as I did not have that as a distinct paper,Ii just had Taxation 1 then Taxation 2 then the TPC in final year which pulled in aspects from all the first two years, our tax papers were distinctly more computational the compliance parts re say TMA 1970 were covered but not as a distinct paper.
Auditing (as ours was called) was a different beast, the actual practice of doing auditing was not applied re testing processes (System notes, walk through tests, compliance test and analytical review) the exams more covered the role, the audit planning process, materiality, auditor responsibilities- very tedious and the work I did throughout my apprenticeship had little bearing as these roles were more done by audit seniors/audit managers, so the trick was work out what the examiner wants, how he wants it and then deliver to that standard. So past papers/model answers/course note examples were the order of the day. (ICAS did its own training so did not have the training firms like the other institutes, we were issued with the course handouts by our institute)
I note ICAEW has for registered parties some available study support paperwork on its website (cannot see it as not a member) , I think you may want to look at this/similar.
I tended to work in the evenings and on the train home about 2 hours a night plus more at weekends and of course on study break/ block release, you may not be doing enough hours-nobody said it was easy to do a job and study, the key with professional exams is not that the subjects are in themselves difficult, imho university was more academically challenging but you have more time to get through what is needed, professional exams need different skills and time management is crucial.
Do not get dispirited, when I sat mine you had to pass all paper re part 1 in one go, fail one fail all (unless you got a referral in one paper) and something like 65% failed at first sitting, the secret is just to try harder and smarter and once they are all over you have a life on endless CPD.
Edit: in the time I took writing someone has now answered.