If you have more than 1 student using the iPads, this article will show you how to clear the cache so that the next student can log in to their Infinite Campus Student Portal.
On Chrome hit the 3 dots on the top right-hand side
then go down to History
Hit Clear Browing Data
for Time Range hit ALL TIME, then hit Clear Browsing Data
This will clear the other student's login credentials. This will need to be done every time a new student signs in to Infinite Campus in a shared iPad.