Learning the subject is different phase and preparing for interview is different phase. Having better understanding of concepts is important and talking about resources: go for previously and most asked questions in different data science interviews. For that I would like you to refer this video which covered the most frequently asked questions in all data science interviews. This video covers all theoretical, practical and conceptual questions that you expect in your interviews.
Go through these list of questions which provides better understanding of data science interviews. Along with that have a look at this data science course offering by Intellipaat which will help you to become a skillful data scientist.