Well you can submit your app because you have a score already. But if I were you I would wait to get your December score so you can make a better first impression. An app with a 155/138 looks way better than a 138 app with a 155 update.
I wouldn't think it would be frowned upon. As stated above, if your app has changed for the better, then by all means apply. The persistence will pay off. Best of luck!
Your post is incomplete. It happens to me a lot when I am using the 7sage app on my ipad. Sorry can you type it again. Just select all after you are done typing in case there is some error. This way you won't have to type everything again.
@UsernameChange is correct and if you fail to list it in the app when it is required then it will not let you save that page until you enter your high school information.
If you look at the games menu in the app you can see all the categories in one place. Best thing to do is just fool proof those games and watch the videos.
Are you using the app? If so I would suggest using Safari on an iPad and logging into 7Sage through there, it is much more consistent and I've never had an issue that way.