Arewedone Do you mean just drop, or do the AS and drop. Our school starts with 4, and is asking everyone now to decide which one they want to do for AS and then drop, leaving 3 for full A Level.
As an aside, DD has just dropped Biology, which was her fourth, and was going to be her AS. However, she was really struggling, and wanted to focus more time on her humanities, and get in some extra reading for those, with a view to applying to Oxbridge, so they have allowed her to drop Biology early. She is really happy.