Good interview resource for prob/stats styled coding question?

I'm applying for ML positions, anything between ML engineer to Data Scientist. Their fucking questions are all over the place.

So far I've encountered 3 major question types
1) Traditional coding. I'm using leetcode for this.
2) Traditional probability & stats. I read up on A/B testing and use quant books for this.

3) Coding with probability and stats - this is the toughest one. Questions are like:
- Given uniform random number generator how do you get a gaussian random number generator
- Given random(1,6) function, make a random(1,n) function

Does anyone know of good prep material for these type of questions that are not pure coding and not pure stats/prob?