How do you prepare for optimization interviews?

I have a job interview for a role I really want. They said i have the exact same experience and they reached out to me.

In the process they said they will cover stuff like
Probability, machine learning, etc..
Thats all good but they said they have two interviews were you build
A ml algorithm on the spot
A optimization model on the spot.

For those that did those what should i do and prepare. I really want to do …

build datascience etc experience good interview interviews job machine machine learning optimization probability process role will