Personally I passed the SCWCD 1.4 which covered the SCWCD 1.3 and I have never heard that you are supposed to know anything about TagExtraInfo (except that this tag exist). About filter this is not part of the SCWCD 1.3 but this is for the SCWCD 1.4.
Good luck for your preparation,
Adri
PS: If you have time to study more than required for the SCWCD 1.3 maybe
you should try the SCWCD 1.4. Just an advice...