Me.IamCris

But who are you to make that determination of someone's relationship being real or 'just for a green card'?
See my K1 timeline? See how long that took? I can guarantee there are plenty of K1 couples that took even longer. For no understandable reason beyond the claim of 'backlog'. It wasn't due to background checks, or problematic cases, or poor paperwork, or even lost paperwork. It was due to the stupidity of the USCIS process. K1s don't go in front of you, they get processed by a completely different service center and undergo different methods. It may be frustrating that those persons may through whatever hardships they face in their own process get to be with their loved ones before you, but I assure you it is no less frustrating for them. A DCF is going to get through even faster, is their relationship less valid and should be slower?
As a K1 we proved our relationship was real and genuine. The length of time we had known and been in a relationship with each other was vastly longer than probably the average couple, but this makes little difference to me. How do you define the love that someone has for each other based on the length of time you have known them? I cannot judge someone like that.
Did it make me upset to see so many K1s get 'finished' months and months before mine? Sure, but I wasn't going to begrudge them their happiness or question the validity of their relationship. Did it make me further annoyed that despite all the lobbying, that when action was taken to rectify the processing times, it only helped those already at the front of the pack instead of those stuck in the back? Oh absolutely, but there is nothing you can do about it. Someone is always going to go in front of you.
Do I agree it's a horrible and lengthy unfair process? Yes. But you're pointing fingers at the wrong place.
And remember just because my spouse is now in the US with me, and you are still waiting, doesn't mean that we aren't still bloody waiting. There is no end in sight to the wait we're now enduring for AOS, a process you won't have to go through at all. We all want our loved ones here, and it's a shame how this process is... but it's not their fault. We've only the government to thank for it.

Hi, Which school do you attend? Did you get a status letter saying you are a student? If your mother supports you then that is another tie. At this stage in life they don't expect you to have much else, like owning a home etc. Being a student actually gives you good odds. Just make sure during your interview you make it clear that you have to come back to school. Do not tell them you are scheduling a trip during a time you are expected to be in school or for a long time that would require you to be out of school for a long time. You should be fine. Try not to be too nervous when you are there and tell them the truth and you should be fine.

Good to have as a student, even though most likely 85% chance the Consular Officer wont ask for them.
1. Status Letter ('hopefully' you are not in your final year because that loosens your educational ties a bit; but if you are, nothing to worry too much over)
2. Official Academic Transcript
3. School ID
Typical questions for a student?
1. What school do you attend?
2. What are you studying?
3. Do you like what you are studying?
4. What is your current GPA? (...just maybe)
5. What year student are you (1st, 2nd, 3rd, 4th)?
6. When do you graduate?
7. Where do you want/hope to work when you graduate?
8. Who pays your tuition?
Other general questions:
1. Have you ever traveled to the US or any other country before?
2. Why do you want to travel?
3. Do you have family in the US? If yes, where do they live?
4. How long do you intend to stay?
5. Who do you intend to stay with?
6. Will you be travelling alone?
Try to keep your nerve and not get too shaken by the tight security environment. In all reality you probably wont be in front of the consular officer long enough for he/she to ask you this many questions.
Don't over do the formal dressing, really not necessary to look all uptight. Besides all the formality makes you feel that much more uncomfortable, right? Moderately dressed is fine, no matter if male/female: cover your toes, cover your knees, cover your chest and upper arms.
Last but not least, say a prayer before and after, no matter the results.
All the best!