I'm an offer holder for PPE and I take Maths, History, English lit and Politics at A2. My understanding of how PPE admissions tutors feel about A level choices is this:
- Nothing is compulsory. They like maths a lot though (it links to economics in an obvious way, as well as the logic aspect of philosophy). The standard offer for PPE is AAA but if you don't have maths they generally ask for A*AA and you might want to demonstrate in your personal statement that you're capable of basic maths and reasoning (although that's partly what the TSA is for).
- They also like history a lot.
- I don't think they're bothered about A level politics, philosophy, or economics. They'll only have to reteach it to you if you get in. But taking one at A level demonstrates an interest in the subject, and obviously if you like it and think you can do well in it you should take it. Basically, they neither like nor dislike these subjects.
- Aside from that, try to go for 'hard' subjects.
The most important thing is that you like and are good at your A levels, because whatever they are, you'll need to meet your offer if you get one!