Honestly.
I think the biggest mistake you can make in year 12 .. or one of them atleast is..................
doing TOOOOO many practice exams in a short period of time.
in the last month and a half or so i did maybe .. 40-50 prac exams for each subject? . for psych i did EVERY paper i got my hands on , every single QUESTION i could find.
you should aim for honestly .... 15 papers at MOST.
all my friends who got why marks only did around that many .. 20-25 AT MOST.
you should aim to PERFECT answers on one paper before going to the next.
i made the mistake of doing a paper ... getting around 80-85% .. and vaugly learning answers to the ones i got incorrect and then moved onto the next paper.
you should do 15-20 MAX to familiarize yourself with the questions well .. and at the same time , be able to perfect each question.
i regret doing so many papers , i should have done less and done them properly ...

thats my opinion.