I don't hear anyone answer with 'so an so'. 'Not so / too good' are common answers.
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slocawberHow was your school day?Not enthusiastic:
CalifJimSo so.Not bad.Nothing to write home about.Could have been better, could have been worse.CJThese are all good. There are also many other possibilities. Some, among others, could be great, terrible, awful or boring.
slocawberIf the question is: 'How was your school day?'This is not very natural. People would normally say: 'How was school today?' or 'How was school?'. They might also say: 'How was your day?' when it is clear that they are referring to the other person going to school.