The main thing to remember is that you should try to play to your strengths. That said, I was one of those people who decided to do 3/4 Further in Year 11 with Methods and Specialist in Year 12, and I very quickly gave up that idea, finding out just how boring Further is after about 1 week. It is not worth having a subject that you hate and are sick of, particularly when it is your 7th subject anyway. I would suggest having it as a backup plan in case you dislike Business/Chemistry or if you do badly in one of those two. Specialist and Methods are quite as worth doing, since they scale up, so that if you are at all good at maths, you will probably get a higher mark in those two than in Further. Personally, I enjoyed both Specialist and Methods 1/2, and Physics and Chemistry 1/2 as well. Have a great year, whatever you decide!