I do both chemistry and physics and I just find physics to be easier. The concepts in chemistry are just too numerous, there is so much to learn. Physics is more fun too.
my next physics asmt would be the half-yearly in term 2 and I would like to make a decision by mid term 1 so I could focus more on my extensions, especially my Japanese extension. (see my other post: http://community.boredofstudies.org/showthread.php?t=253016)