CLB 9 in all 4 grants you extra points related to say work experience.
It's the most significant way to gain extra CRS points.
The problem many of us suffer from is missing out in one of four tests and not getting those extra bonus points.
The even more idiotic system means you cannot even blend IELTS/CELPIP results to use your highest scores, how this is meant to be a true reflection of your standard of English escapes me.
If you struggle with writing I would recommend getting a tutor to help, I used one and did some very good 7/8 band essays in practice. However I failed to carry this over into the last exam, time pressure and flapping over the stance didn't help me.
If I had done the same exam on a computer in celpip I would have been fine, as how the F*** are you suppose to edit your essay in IELTS.
Points are dropping so if you are 410+ I would be cautious before booking another IELTS, even if you don't get the results you need to bump you into guaranteed ITA status. Unless there isn't another draw for 23 days like before then you could be wasting your money and effort.
I'm on 418 and waiting until after 26th to book celpip