Bridge extension of student permit

[Kana.L]

If someone had same situation as me before, please give me some advice.

I am completing my program in December and thinking to apply for post graduation work visa after my study.
The problem is that my student visa will expire on December 31, and I might no be able to get all grades before the date.
As I researched, I will be able to do "bridge extension" for my student visa; however, the government site does not have much information for it.

I would like to know...
1. Which application form I should use.
2. Which documents I need

Thank you!!