Can I study accountancy at Oxford or Cambridge?
No, Neither Oxford nor Cambridge offer undergrad accountancy or finance degrees. You could study maths which may lead to a job in finance. If you would like to be an accountant after leaving uni, you would be better off studying an accounting or finance degree at a different university. check the UCAS website for universities which offer the course you want and then choose the best uni out of those. Oxford and Cambridge still really only offer classic subjects and sciences.