Yeah about ssNake's point; If you're guessing multiple choice then pick one letter and use it all the way down, don't change. The probability of getting more correct that way is much more than random guessing.
I question that. You're both assuming that the division between the five answers A-E is roughly equal, with the answers obviously mixed up in some random pattern. So you say therefore, put the same letter in each one and you're bound to get 20% correct. Look at it on the flip side though; you're essentially saying to intentionally put the wrong answer in 80% of the questions and guarantee that you'll lose these marks. While I do agree that it seems like this strategy works in practice, in theory I don't think the odds are any different. If you randomly guessed each question, you're still sitting on a 20% hit rate really. Difference though I guess is that in practice, nothing goes to how it's meant to in theory, meaning that if they follow your strategy, they're BOUND to get 20% correct (assuming that there definitely is an even split between the 5 letters). I guess for those who are more on the gambling side though, by randomly putting in answers, your chances of it varying either side of 20% are equal, meaning you could potentially gain more marks

But no, I wouldn't say your probability is 'way more'. Probability's never been my strong point though (it's what cost me my 50) so feel free to challenge.
EDIT: Sorry for being off-topic but I thought I might as well bring it up given probability's part of methods anyway. To put it back on topic before this ends up being a probability debate, basically you've said you've gotten A+ on all your SACs which doesn't correlate well with that exam score. So basically:
1. If you need methods for a pre-req, well I guess you don't have much of a choice.
2. If your school's being too lenient and you're actually not that great at methods, could consider bombing out on it intentionally into the bottom two and concentrating on Legal.
3. If you're actually decent at methods but Kilbaha is just retarded (often is the case), then perhaps revise a bit more and aim to do well in Methods.