What do you want to study at university/after A levels? If you think you would prefer drama, I'd go with that because if you enjoy it, you're more likely to put the work in and are more likely to do well and get the grades. As long as you have the required subjects for your course and are predicted the right grades, you will be looked at just as competitively as someone who's studying philosophy rather than drama.
I do politics, geography and philosophy and ethics so v similar!!! RS, because you just write 40 markers of one format, really really improves your essay writing skills, so that will help for history- they also go well together. It's such an interesting subject, we all love it. Though there's lots to learn, there's less pressure on your revision (at least for my exam board) because when all you write is 40 markers, if you forget a quote, or one of the five precepts, the examiner will never know and penalise you- if that makes sense- whilst in geography and history that would show!! You can always do drama outside school too.