Students can give themselves any name they want in their PTC account, so its not always easy to find them. Best method is to simply add them all by email address. Either get them in a room together or have them all send you the email address they used for their PTC account.
If students, mentors, teachers, etc. are creating new accounts, be sure they use the "Academic" option for their account. This will let them chose their academic program of choice, FIRST, to make sure they have access to all the right content.
