You are a citizen of the 21st century. You have no excuse for not checking and responding to your email daily. The worst thing you can do in this program is not communicate with your editor or the program coordinator. In addition to email, your editor may create a Facebook group, a KakaoTalk group, or another social media-based group. Stay in touch with your editor, no matter what.
Every single deadline you have is available on this website, which can be accessed from anywhere in the world. If you miss one, it is no one's fault but your own.
In short, the JSR program treats its students like adults. You are expected to stay on top of your deadlines without being nagged or reminded by JSR staff or your editor. You're expected to respond to emails, whether they are from JSR Staff or your editor, in a timely fashion. If you fall behind, you are expected to contact JSR to discuss what you can do to make up your work.
We are not tyrants. JSR is challenging and it has a long schedule, and most students are going to make a few mistakes along the way. That's totally acceptable. What's not acceptable is not taking responsibility for your mistakes. What's even worse is if you blame someone else, such as your editor.
If you need help, or if you need to miss a deadline for some reason, contact JSR and your editor in advance and take pro-active steps to make it up.