Here you get some tips which will help you to get verified if your page is official.
3. Government Officials
4. Popular Brand or Businesses
Actually Facebook page verification depend on accuracy and popularity. So first you should add all information.
3. Click Page Verification
4. Click Verify this Page
5. Click Get Started
6. Enter a publicly listed phone number for your business, your country and language
7. Call Me Now to allow Facebook to call you with a verification code
8. Enter the 4-digit verification code
9. Click Continue