Heidi is a 20 minute study track that is perfect for primary school students. 
The music is at the optimal tempo to facilitate whole-brain learning.
 
When the track stops, the student should get up and take an active break. 
No TV, reading, electronic games, etc. 
Go outside if at all possible, play with the dog, shoot some hoops, jog or walk around the block, etc. for 10-15 minutes before resuming homework or studying.