Is it adviceable to ask your formal student in secondary school out? The girl in question is mature now , and even in a higher institution . I just like her , but I don't know if this is right . Also putting in consideration of the fact that she may say 'No' to my request . Advice pls .

With right intent,it isn't wrong. Her response will be determined by the record you have with her. If you aren't of a questionable character and she knows,if you v bn a lovable teacher too.....She'll say Yes.
On a lighter mood now....... Seems you v bn crushing on her even when you were her teacher.

how old are you and how old is the girl too?

She up too 20 now

If she's old enough, go ahead.

Swissheart:
With right intent,it isn't wrong. Her response will be determined by the record you have with her. If you aren't of a questionable character and she knows,if you v bn a lovable teacher too.....She'll say Yes.
On a lighter mood now....... Seems you v bn crushing on her even when you were her teacher.

I concur