关于NIW,请教大家和假博士

I applied NIW last June. Last Oct., I got the first RFE which request lots of evidences from INS. I replied last Dec.. A few days ago, I got the second RFE which only request ETA-750B(fully completed) statement of qulifications of Aliens, in duplicate, as well as evidence to surpport the claim that such exemption would be in the national interest.
I appreciate it if someone can share his/her experience with me. How much for my NIW case 成功率?

Thanks in advance.