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I wouldn't worry about it, the only people who it'd really help doing well in their 4th AS is those who are looking at Oxbridge, Durham etc. It's better to just concentrate on doing really well in 3 instead of worrying about the 4th one and it bringing you down in other subjects, pretty much all universites won't hold it against you at all

I did Psychology at AS as well and hated it, got a C and dropped it then did well in my other three so it didn't stop me getting offers from anywehre