Vanessa Slattery

Submitted the N-400 mid-December, then received a biometrics a day after the New Year. Interview scheduled mid-February 2018. Seems very fast. This is a mid-West location.
 
Online seems faster. One point is: They do not notify you of the decisions by email. You have to log in every so often to see the updated. Or wait for the snail mail which takes a good week later to arrive.

You can check progress reports on VJ and the timeline varies by each field office. Search for your field office and you'll have a better idea.
From biometrics to citizenship interview can take a LOOOONG time, a lot of people have to wait for 4-7 months to be scheduled. 
However, I'm a Boston MA filer (online), and I filed in OCT 2017, did my bio in NOV 2017, and had my interview on JAN 2018. Just received my oath notice, and it's in Feb 2018. 
The original estimated timeline shown on my online account said it'd be completed in April 2018, so I don't think that timeline is accurate.
 
Good luck! 
Btw, for the civic tests, there's really no need to start studying so early, when you get your interview letter you'll still have about a month to study. 
This is the website I used, the reason I like it is because it's not in multiple choice format. When you do your interview, you need to answer the questions not "choosing" the right answer.
https://civicsquestions.com/

They'll give you a booklet to study for the Naturalization test during your biometric too.

I hope so too !!! Thanks ! 

Wow that was fast right ? 
Thanks for answering ! 

when you login in your uscis account go to resources and from there u can click on practice questions