?? No. It is not the sandbox. It is the waitlist to get into the NSSA Segging academy : https://nssacademy.weebly.com/applicant-list.html
The link to the sandbox is here: https://subber.viki.com/sandbox
Please wait while document loads or click here to view in a new window. This list shows the order in which applications were received. Highlighted users have already been accepted into the program. Therefore, the waitlist begins after the last highlighted user.
They’re saying they’ve already been accepted, gone through the sandbox and intro emails etc, now they’re waiting for their level 1 assignment.
oh… In that case it can take a while for each level. It depends on teacher availability. I don’t know how many teachers are in NSSA.
bumping the post for ev new volunteers 
How do we get to the course after being accepted?
When you have been accepted you will be contacted, you just have to wait.
how long does it take for them to contact?
It depends on how many there are before you, just hang in there and why not read up on things whilst waiting… NINJA ACADEMY - Blog
NSSA will send you information about your sensei to your Viki email account once a seat opens for you.
You can see where you are on the list here: Applicant List - NINJA ACADEMY