IPad won't keep charging?

My iPad Pro won't continuously charge when I plug it in. It will charge for a few minutes to about an hour, but then it will stop. It's not the cord, which I know because it's not broken and is working for my iPhone. The same goes for the outlet. It also doesn't hold a charge for very long.

I think it might be because I'm using the charging cable for an iPhone. I know this is why it charges slower, but I don't know if the size of the cable is supposed to impact whether or not it can support charging an iPad.

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My school doesn't allow cellphones what should I do?

I'm a freshman in high school, soon to be a sophomore and I have been going to this school for like 4 months because we moved and I hate this school, they don't allow cellphones. This school reminds me like the freaking 70s or something, if they catch us with a cellphone they will confiscate It so I have to leave it at home everyday, the school doesn't even have any computers in the library, only books. Is this legal for them to do this? We don't get to use technology, we just use books, and notebooks and stuff. At my old school we did all of our work on the computer and iPads.

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