There are a lot of questions that could be asked in a viva. There are lots of resources that share typical questions you could use to prepare for the viva. If you wanted, you could write down key points and perhaps try to memorise them. A mock viva could help you to get a sense of what the viva experience might be like too.
But none of them can give you a script to prepare for and follow.
Instead questions, if used well to prompt practice and discussion, can help you to stretch a little. Exercise your ability to respond to questions, to think on the spot, to dig into a topic and listen and reflect and talk. All of this can build your confidence for the viva much better than rehearsed lines for you to read out or recall.
You need rehearsal for the viva, but you don’t need a script.