So, this OVA is situated in between Seirin's games with Shutoku and Touou. It takes place just before the championship league during Inter-High, and it deals with Kagami cramming for a test so he'll be eligible to play in the championships. You'll also see a bit of Midorima and Kise talking about these tests as well. I don't really recommend you watch this episode before Seirin plays Touou in the championships simply because they do show Murasakibara and Akashi in this episode, and I feel like it takes value away from their reveals in the second season. This was funny little episode as you get tosee the members of Seirin spend a lot of time with Kagami in an attempt to raise his scores. It wasn't anything too special, and obviously, it didn't really advance the plot, but it wasn't really out of place either. It didn't seem like an extra episode, in other words. Kagami and the rest of the team were still stressing about the championships, so it wasn't as though this episode ignored the rest of the plot because it's an OVA.

I don't know, I rated this a 10 simply because I love these characters, so if you do, too, then watch this OVA.