You have calculator and notes so not all is lost.
Learn most of the stuff from the main areas( Calc, Probability, Trig) you don't even need to remember it. You just need to know how to use it and how to use your calculator.
My System So far has been this:
*Do an exam (even if i know ill do absolutely terrible, try my best)
*Correct it right away.
*In green pen circle the things i lost marks on because i didnt understand
*List them in my notebook over 3-4 pages
*Learn how to do them and write it down
*Repeat
I found at the start of doing this for biology i added like 8 things to the list... then it was 7....5...3... eventually i wasn't loosing marks because i didn't know things only because i made silly mistakes.
(It may be too late for my system though, i'd suggest really trying to learn the things you dont know, especially if theyre considered basics and try apply it to a couple exam 2s. Only do questions you don't know/ unsure of. No good wasting time doing heaps of probability if youre ACE at it.)
You have an entire weekend and the rest of today.
If you work hard you could get at least 5-6 exams done.
Really its not over till its over... One extra mark in the exam, is one extra mark. Can put you infront of heaps of other people.
I like to think of it like this, for every minute of study put in you could gain a potential mark.
It's not all matts fault, we've all messed up before.