I have been on interviewing panels and haven't seen a pre-interview grading system, so it must vary from instituion to institution.
We wouldn't have a "pre-interview" grading system but because the actual interview is so short a lot of one's impression is based on the paperwork. Hence, I think that making the CV as strong as possible is very important.
Whether HR will accept a late updated CV is not clear to me but I can't see any harm in making the effort. However, I would think about sending a short email, rather than a CV, just noting the improvements in ....