Which LSAT Tests in Particular Does Khan Academy Pull Questions From?

Hello,

I'm using Khan Academy (KA) as a study tool in addition to self studying by taking full practice exams on my own. I know that KA takes their questions from actual LSAT exams both published and unpublished (which I love!), however, in my self studying I do not want to take the same tests that KA pulls questions from in order to prevent my self from coming across repeat sections or content I have already completed on KA. Do you or does anyone happen to know which published LSAT test numbers Khan Academy pulls questions from so I can continue taking full exams alongside my studying using KA? 

Thank you for your time!

-A