Oo, you can get certified in proficiency with a test offered by ACTFL: http://www.languagetesting.com/oral-proficiency-interview-opi

Evone is right.

There is no Tagalog Language certification, you need to have a Baccalaureate degree (Bachelor of Arts in Linguistics  which is a 4-year degree program).  In the Philippines, I believe only the University of the Philippines in Diliman offers this academic program. 

I don't think there's any standardized one that is officially recognized here.  

I think none, just a college diploma if you took Filipino major.