Sorry, maybe I wasn't clear enough.
You can only get whole band scores on the IELTS Speaking Test. So, you could get a 6 or a 7, but not a 6.5.
This is also true for the Writing Test. On the other hand, it is
possible to get half band scores on the listening and reading tests,
and your total score (the average of the four band scores) may also be
a half band score.
Let me know if this still isn't clear. It can be confusing!
John