Flashcard selection

I have a question regarding thr flash card software. Currently, I am using flashcards to revise vocab for HSK 5 & 6. For each test, I have selected to have 10% new vocab. As I am more familiar with the HSK 5 vocab, I was wondering whether I could increase the new card selection to 25% while keeping the HSK 6 vocab at 10%. Thanks a lot! :)