I took math 1LS3 and it is really easy, and if you get a 10 (an A-) you can take math 1AA3 after (if you need too). One of my friends couldn't get into math 1A03 like he wanted and after he called them they let him in. What are you going into second year though, because I asked the director of one of the biochem programs about math requirements and she said that she knows 5 equations, none involving calculus so I wouldn't wake math 1A03 unless you actually need it or are pursuing a physics or math based minor or such.
ps: Even if math 1A03 may seem like a more "smart" for better lack of words, math there is no point in taking it if you'll never need to use half the info from it (for anyone who's facing this dilemma like I was in first year)
good luck