Hi,
Congrats on being accepted to MUA.

You really don't need much science background and I am sure you have some highschool science, i.e, you know what Na and Cl symbols mean. I sure didn't have any background (engineering) when I started four years ago. I also started with pre-med and it helped me a lot. Lots of ppl do premed and waste the 8 months they are on the island. Spend this time wisely and you will do extremely well.

goodluck