i know this may sound very silly, but does anyone have tips on answering multiple choice? im always loosing atleast 10-12 marks in that section. 
Well is there any particular reason that multiple choice seems to be a weakness?
Multiple choice is attacked through either calculations (alike short response), process of elimination or immediate deduction. The third option is just something that comes with practice.
If it's a calculation, then the worst thing they can do is throw you a twist. Figure out what the twist is. Not simple? You have to do even more past papers. You only learn tricks by being exposed to them (unless you're that capable).
Otherwise, process of elimination is one of the most common things in multiple choice. Eliminate what is wrong so that you narrow down your opinions. Whilst occasionally this narrows you all the way down to one correct answer, generally you only have two to choose which you just use your brain power to figure out which is right.
Multiple choice is generally more applied (calculations) or logical (reasoning). Practice more of these questions to get better at the style. Board of Studies Multiple Choice can be used if you wish. Also, keep in mind textbooks such as Excel Success One explain the answers to multiple choice as well.