a level choices

my dilemma is that I’m interested in three considerably different career paths which means my A Levels may not pair well with eachother

Could I realistically get into a Russel group or Oxbridge uni for a degree in Law, Economics or Comp Sci if my A levels are English Lit, Physics, Maths and Further Maths. And if I replace any of these with French/modern languages or Chemistry which would it be?

And also, are there any decently paying science degrees/careers that aren’t medicine or dentistry.

Also is Psychology a hard a level?