An easy way for an experienced teacher to get a proof of him knowledge

I am a tutor of English myself and found it essential to obtain a certificate that proves my knowledge. I have found this course easy and comfortable to study. I refreshened my theory knowledge, learnt new things as well.
The course is engaging and encouraging. I loved the percentage taskbar that motivated me not to lose the tempo. I loved the recording of actual lessons with young learners.
The platform is absolutely comfortable. Once I had to contact the support and they were fast and answered as soon as their working hours had started.
The only thing I was lacking is the absence of video examples of work with adults. Everything is more focused on teaching children. But I don’t regret the experience. These were well-spent money. And I am thinking of obtaining more courses on the platform.