If you submit both, the most recent one will be used. and remember, they will consider the whole set of band scores together not the highest ones from different tests.
Well, you have to apply within a year of taking IELTS if you want to use that IELTS for your immigration. The IELTS stays valid for your processing as long as it was less than a year old when you applied.
I checked on IELTS website and it is mentioned that you can sit anytime.
Well, I never checked on website because as everybody was saying that there is 90 days limit. this rule is effected from 2006 which I found at some forum.
Thanks for dropping this topic or else I never came to know about this earlier.
actually i haven't check the IELTS website yet. But what i did was to inquire at the IELTS test center administrator. She said that before it used to be 90 days. Atleast now i know that I still have chances to take after a week or 2 if I'm not satisfied with the test result.