I reckon it's better to keep going the way you are. It would be better to feel more prepared and not having to worry about whether you're slacking off too much. :)
I swear in the previous years like 2004 and stuff I'm getting 14/20 in MC but in 2013 and 12 more like 17/20. Is it just me or are the exams becoming easier? Just want to confirm with others :)