Haha, oh gosh, please do not be inspired by my life. I think the only reason some things go well for me is because everything else goes really, really bad, but like, I'm not complaining, in 4+ years time everything will be super good.
But yeah, please don't follow what I do, I'm really lazy. Work hard and stuff. ^_^
Anyways, I think Sc/Engg might be a bit shit if you want to get into med.
But I would suggest picking one or the other.
If I were you I would do either Eng/Sc or just Eng in first year.
See if you like Engg or Sc
and stick with the one you like
because 5 years is a long time if you're going to get into med
3 year sc is probs best
but if you're better at engg, then one more year is fine