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The Cambridge website gives its guidance at
Open the page on AS and A levels
They say "Most applicants are studying three or four A Level subjects. This is usually sufficient to show breadth of interests and ability to manage a range of differing academic tasks. We’d rather applicants develop broader and deeper knowledge of the subjects most relevant/closest to their chosen course than accumulate additional A Levels. For advice about suitable subject choices see our course requirements section."
Check the information relating specifically to entry requirements for the course that interests you.
When making your decision you should remember that you are in competition with applicants many of whom will be offering four or more A levels.
Please also read an insider's advice about applying to Oxford and Cambridge at