Earlier I’ve been ghosted on expert and I was grade 4.The requirements for grade 3 are 0 violations. When I get to grade 3, will I have to wait an extra week to get back to grade 4?
You will have to wait a week. Ghosts remain on your grade until they wear off, like violations.
So to get up 2 grades I will have to wait one week only?
No, you should be back to grade 4 as soon as the week is up (I might be wrong)
Assuming this is your first report in the last 2 years, you will be back to grade 4 in one week. It will be a lot longer until you can get to grade 5 though.