Its really up to you, I was in a similar position..I wanted to change Bio to business studies...but i had a really interresting bio lesson XD...you have to give it time...Dw biology is like a notch up from yr 10 science...1 week is not enough to judge a subject IMO..because half the time, teachers a talking about how hard the subject is etc...doesn't matter where you go /which subject you choose, Its still going to be a lot of work to be done...
I was about to change to B.S. but decided to keep Bio, I'm going give it a try...Bio is a combination of skills, memorizing, and understanding. B.S. and legal studies is more of-- heaps of writing, memorizing, and more writing, and probably more orals.. lol...
Its up to you...but Give it a chance...Because what if you go to legal studies and don't like it...
good luck with whatever you do...