Great to see that you're interested in buying tickets but as of right now there hasn't been an announcement of when student season tickets will be on sale.
Last year they went on sale September 23rd and was announced they would be on sale the 16th. I haven't heard much about when it will be this year and with the late announcement of the schedule I think it could be a little later this year. I expect the announcement to come soon though, so keep checking back here or on soonersports.com and I'm sure you won't miss it.