You need to be able to prove that you have been a full time student from the time you were 22 until now (and that you are still in school full time right now). If you can prove this and have genuinely been in school full time from the age of 22 - then you have a chance. However you should expect CIC will look at your evidence extremely closely since 9 years is a long time to continue to be in school full time (I assume you've been working on a PhD?). I assume the transcripts you sent cover all of these 9 years and that you also provided further evdience that you're still in school full time now.