Well! I have no idea about celpip but if I heard so that GRE is the easiest exam for PR purpose. Many of my friends succeeded in GRE in their first attempt. But I'm not sure if GRE is acceptable in your case or not.
Thanks for your criticism!
Well! Yes there is no pet formula.
And this is just an experience as I've already mentioned in the thread description. If you don't want to share yours then it's up to you.
This thread is based on my personal knowledge and experience about IELTS exam. I would be happy to help you out with the best strategy for IELTS preparation.