I was worried about TRF number, thanks for clarifying that.
it took how many days for you to get your re-valuated results?
lastly, how was your confidence about your writing?
My TRF number hasn't changed because I haven't collected it from them, they directly sent it out to IDP Australia. But I also heard many cases that TRF numbers have changed, so just beware.
It took 25 days to hear from them which says my score has changed. Then I checked my result online and saw that my writing score increased to 7 from 6.5.
For my level of confidence, I was pretty much sure that I've done better than a 6.5-essay. I still remember what I wrote on that day and evaluated it by myself according to the writing criteria -grammar, lexical resource, cohesion and structure, and I would say that I couldn't find anything wrong with my essay.
Btw, I have never got any help from a tutor or never used a correction service before.