Yeah that is a bit hard to get with TOEFL I think in comparison to IELTS. I got 24/30, which is fine considering some days I cannot even say my own name. But TAship cut off is 25/30 which may be a problem. I swear man, I have cried so many times and just locked myself in my room so many times just because I was born with this. I have faced ridicule, struggled twice as hard as the normal person just because I have this disability. I feel sorry for every stutterer as I know the struggle they have to go through to pronounce every syllable.