Here's a testimonial you could use:
"Neha's coaching has been a transformative experience for me. Before working with her, I struggled with stammering when speaking English, which severely impacted my confidence. Neha helped me identify the underlying causes of my stammering and provided tailored strategies to overcome them. Her guidance and support not only improved my spoken English skills but also boosted my self-assurance. Thanks to Neha, I now communicate more fluently and confidently in English. I highly recommend her coaching to anyone looking to improve their communication skills."