A level traditional subjects?

If you really are interested in these subjects then you should take them as you will be more motivated to do well as you will be interested in them, and in turn, get better grades. Only you can know if you are 'biting off more than you can chew'. In my opinion, of course you can get good grades with hard work. Read up on the subjects beforehand and maybe buy the revision guide. With a lot of determination and motivation brings success in almost anything that you do. Also, the fact that you have gotten A's and A*'s at GCSE level shows that you are a hard worker and scientific-minded. I wish you all the best look and wisdom in making your choices and I hope you live to be happy with whatever choice you make. If you don't go for them...you will never know if you could have/would have done well. Have confidence in yourself!!