what happens if i renew my student visa on the day of expiry?

Answer 1

my advice is to renew it like a month or 2 ahead before it actually expires.

Answer 2

Nothing. The clerck will look at you suspiciously, sort of thinking "That ***....he waits until the last second to renew his visa. He is lucky to be a student, my parents did not afford to send me to college and here I am renewing the visa of this lazy bum for 900 bloody bucks per month."

Answer 3

You'll be deported because it will take ages for it to be passed back to you