DD1

This is my opinion only. 
I feel that I would wait for 751 approval before filing N400.
The reasons
- Basically by doing that you are unnecessarily turning the your 751 application to Interview also (it it is not approved when you go for interview)
- If they combine 751 and 400 interview then there may be big/long interview (as they need to look more closely to both the application)
- If we you are not in rush then I don't make 2 things combine and make things complex.
- If you wait for 751 approval then N400 interview may be small and less complex

My souse has interview in Nov. in Mumbai for CR1.
My Spouse got a call from embassy. They asked following questions:
- Done with 260?
- Done with PCC?
- Done Medical?
- did you get appointment for finger print?
When asked they did not provide name. They said they can not provide name.
Do they generally call? What should be the reason for this call?

We sent in my husband's Lebanese birth certificate and police report which were translated by a sworn translator in Lebanon. There were tons of stamps on it, including a "sworn translator" stamp. When I called the NVC to ask if this was acceptable instead of a certification statement, I was told it would be fine. However, our IV packet hasn't been reviewed yet, so I can't tell you if it truly will be fine. (If I get a checklist, I will certainly be getting a supervisor involved.)