I have found a website that will auto-answer questions for you. There is also a feature to spam the kahoot with bots, although I have not tried this, so I am not sure if it will work. Nevertheless, if you are writing an important test via kahoot, the auto-answer will work perfectly.
You will need to enter the kahoot code and a nickname of your choice
Before the kahoot starts you will need to enter the name of the kahoot
You are able change the maximum and minimum time for the question to be answered
You are also able to change the percentage of correct answers that you want