how cooked am i??

ok so im in year 12 and i want an atar of around 85 because i know im not getting anything higher than 90. i did psychology 3/4 last year and i flunked so badly i got a 29 study score. im not saying this is bad but it wasnt what i wanted. this year im doing english further health bio and chem and honestly ive messed up all the sacs ive done so far which is 3, one for bio one for chem and one for health that is like only one part of the whole aos. i got 43% for my biology sac which is like what the heck am i doing, im so dissapointed and ive been feeling so sick. i got 40% on my chem sac, which im surpised i even passed but im still dissapointed obviously and i got 60% for the first part of health which is really bad as last year on my 1/2 sacs i would get a minimum 85. now i wanted to ask if at this point is it still reasonable to think i might be able to get an 85? sorry for all the spelling mistakes but genuinly like am i cooked pls help and if anyone knows a good and somewhat cheap chem and bio tutor please lmk