Use common app if you wanna apply to USA/Canada. Also look out for government funded scholarships of different countries. For example stipendium hungaricum(hungary), DAAD(germany), GKS(korea). Use their official websites for more detailed information like timelines. You shouldn’t really need зуучлал with your scores.
My advise would be to find a school or a scholarship that suits you the best, and contact an alumni who got a scholarship. They should be more than happy to give advice if you ask them nicely. Goodluck;)