Frustrated with my IELTS results

Frustrated with my IELTS results I did the IELTS last week and I scored 8, 8.5, 8 and…. 6 in speaking. which was the section I prepared the most. I dont feel I stutter (too much at least but for sure I sounder unsure and hesitant with my wording from my years of bad habits. I could have been in top percentiles, but I have to chin up, pay a tutor and try again in a few months. I am not sure if disclosing my stutter might help my case