"02br 02br 00Yesterday I went to the photographer's studio and sat for a portrait. 02br 02br 00And I don't believe one "sits" a test, or even "sits for" a test - not to my knowledge. 02br 02br 00"I just retook the test today," is about the most common way I can think of to put it.
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01cite10Zerox12cite10 Unnatural or not, it is still used by many universities. 12blockquote10I also was going to suggest that it is probably very common in academic circles, where one often sits for an exam rather than 'take' an exam. 0-
01cite10Kooyeen12cite10Hi,12br10Yes, indeed it is! 02br
10"to sit an exam" is ok in British English as far as I know 12blockquote