1. You NOC is not that hot. If you can send by June, you will be in the CAP - that is my prediction but try to send ASAP.
2. If you have done your MBA from Canada, you don't need to assess your degree with any ECA for degree equivalency.
3. Yes, make copies and notarize (optional but I recommend) starting from class 10 of all your marksheet/transcripts and certificates.
Is this needed? If he has done his MBA from Canada, he just has to produce the latest degree certificate and transcript. Does he still need to send copies of marksheets from 10th onwards?
You can scan your documents for preserving the records in soft copy only. You need to courier hard copies of all your documents and forms to CIO, Sydney.