How Best to Practice, Pt. 2: Interleaved Practice
Interleaved practice is the process of switching back and forth between practice tasks in a single session. for instance, you might schedule a practice session to start with Task A, then switch to Task B, then switch to Task C, and then again return to practice tasks A, B, and C a few more times, all in a single practice session. This has been shown to be more efficient than practicing Task A, then Task B, then Task C for longer blocks of time, but without returning to practice them again even if the total amount of practice time is the same as in an interleaved practice routine.
For more details on interleaved practice you might want to check out this article from Frontiers in Psychology