Not necessary, but notarisation increases the weightage of ur documents.
Dear HAMSAFAR, again you are misguiding.
Its required by VO and is mentioned in their instruction sheet clearly
Gather documents as listed. Check () each item on the checklist and attach the checklist to your documents (a paper clip will do). Place all documents in a sealed envelope. Do not send originals unless otherwise stated. Send notarized photocopies of all documents except the police certificates, which must be originals. If your documents are not in English or French, send a notarized (certified) translation with a copy how come you say NO NEED
See these are the factors involved in delaying your process and then you start blaming to VO.
PLEASE DO AS DIRECTED BY VO