Well at my school, students are failing business with the highest grade of 3. Last year's year 11's got the highest grade of a 1!!! I don't know how that is even possible, but it kinda shows the difficulty of doing business. I know people that do business and economics at GCSE in my year and they say that business is learning a load of content from a textbook and economics is more about assessing and analysing decisions. I am aware not many schools do GCSE Economics, so if that isn't an option, then I would go for religious studies. My school doesn't offer religious studies as a GCSE, but I'm sure it will be useful for Law. Good Luck!