Our offers are based on three A levels, or the international equivalent.
It will not benefit your application to study a fourth A level, however, if you are taking a fourth A level, it may be beneficial if one of the A levels you are studying does not meet the grades required in the conditions of your offer.
This only applies to non pre-requisite subjects.
If you are studying four A levels, it is not a problem if you choose to drop a subject, as long as you can still meet the conditions of your offer with the subjects you continue to study.