What GCSEs and a levels are needed to get into oxbridge?

For most courses across Cambridge and Oxford they look for your A-levels to be around A-A* standard, of course depending on which course you go for. Whereas for GCSEs it seems that Oxford pays attention to them more than Cambridge does

This is not really an answerable question. You want to aim for As. I'm sure you will be able to find more detailed info by subject and by Oxford or Cambridge. Oxbridge like 2 Facilitating subjects at A level: Geography, English, Maths and Sciences

GCSEs are seen as evidence of work ethic – and you need a really strong one of those to cope with studying at Oxford or Cambridge. Our 'guesstimate' is that the average successful applicant has around eight A* GCSEs – or 8/9 grades under the new system – under their belt.