BITE THE APPLE UPGRADE

Hi! I'm looking to buy tickets for the Mountain View show. I'm thinking of buying a GA/lawn ticket and then just do a Bite The Apple upgrade since I'm mostly wanting to experience the Soundcheck cause the soundcheck songs are what I'm mainly going for lol.

My question now is, will I stay on my lawn/GA spot and just have access to the soundcheck? Or will I be let in the closer seats to them during soundcheck and just go back to my GA seat right after the soundcheck?

Help a girlie out pls!!!