Why do i have a different layout when i re-downloaded the iPad app?

I agree.  I hate the new layout.  Being able to see the whole topic at once was much better.

The first set of screen prints shows the main "6th grade". The second set shows "Ontario 6th grade". As a user not in Canada, I don't have "Ontario 6th grade" at all on my iPad, so I can't look at it from my perspective. What I suspect has happened is that the Ontario 6th grade course does not have a Mastery Mission set up for it yet. If you are still able to access the main "6th grade" from your iPad menu, you should still get the progress tracker. But if, as a Canadian, or a Canadian located in Ontario, you are automatically diverted to Ontario 6th grade, I agree that this was not a good change to the app.

To summarize, try clicking on an icon actually called "6th grade" and see if you get the old screen. If "6th grade" is now missing from your subject list, or you are redirected to "Ontario 6th grade", then report this as a problem.