Be careful with student mate they say you can buy one but they said to my mate because hes 16 he cant go in the grange as a student as he's more likely to cause trouble..
he only ended up getting one because he told the ticket office they were just going to let his 14 year old brother sit there on his own so they let him go in as a student..
this is why i think you cant buy an student option online in grange or maybe because like i said earlier you have to prove that your still in full time education/uni whatever