If I took electives from another program during my BSc and MSc, how should I list it on my CV? While I was doing my BSc in Applied Mathematics I took 5 electives that were part of the Data Science MSc program. Right now I am pursing a MSc in Computer Science at the same school and I'm taking two courses that are also part of the Data Science MSc. When I finish my master's program in a year, I will have also taken another two courses that are part of the Data Science program. 

So, in total I will have taken 9 courses part of the Data Science program. Since the Data Science program has 11 courses in total, I was thinking on saying that during my BSc and MSc I took 9 out of 11 courses part of the Data Science master's program and list it something like the following (it wasn't actually at Harvard, it's just an example):


2014: Applied Mathemaics BSc
Harvard College, Cambridge, MA.  
2017: Computer Science MSc
Harvard College, Cambridge, MA.  
Additional coursework: Data Science MSc
Harvard College, Cambridge, MA.
Took 9 out of 11 courses from the program (not officially enrolled).


Do you think it's okay to do it this way?
You shouldn't. This is what your transcripts are for.
If you truly need to point out your data science experience, note briefly when you refer to your education, in the cover/application letter, that this information can be found there.
If you don't think your transcript reflects well enough to refer to, then mentioning the courses without a willingness to back that claim up, will come across as suspicious.