You have to get the student tickets upgraded to a guest pass. My family sits in the student section every game they go to.
I had a friend that attended LSU a few years ago, and she used to buy me a student ticket and I sat with her in the student section. Great fun! She paid $5 for her ticket, but mine was $20 something...whatever the face value was at the time.
If you are able to enter the stadium from that side I don't care if you sit with the students. I'm more concerned with students in the reserved sections.
You can get any student ticket and then pay the 29 bucks and upgrate it to a guest ticket and sit in the student section. They stick an LSU sticker on the ticket.
If you get a North Endzone ticket you can walk over to the student section and sit there... any North endzone ticket. I sit in the student section every game and haven't been a student in 6 years.