Here are some resources you can use to prep you for DS interviews. Read them at all costs:
Recommends:
https://github.com/iamtodor/data-science-interview-questions-and-answers (very good)
https://github.com/kojino/120-Data-Science-Interview-Questions (very good)
https://github.com/alexeygrigorev/data-science-interviews/blob/master/theory.md (very good)
Read if you have time:
https://github.com/krishnaik06/Interview-Prepartion-Data-Science (can be used after the first one)
https://github.com/aaronwangy/Data-Science-Cheatsheet (good for review)
https://github.com/rbhatia46/Data-Science-Interview-Resources (lots of resources but can be headache...)
https://github.com/khanhnamle1994/cracking-the-data-science-interview (more resources...