Data on reservations?

I had said that I had moved on, but I must link you to two excellent posts by Confused on the issue. (1) and (2)

Also, in mail yesterday, I got an IIT faculty member's views on reservations. I and another fellow-blogger had talked about doing fact-finding on the issue, and if only I didn't become swamped over the last fortnight, we would have made some progress. What we planned to do was find data on performance of reservation quotas in IITs and IIMs. However, after reading this, I do shudder a little...
"It is the hypocrisy of the highest order that on one hand the reservation for SC/STs is considered a success and quoted for extension to OBCs, and on the other hand, no hard data on the performance of these students is available in the public domain. Some administrators I talked to consider this data as sensitive! Analysis of where the reserved category students go after graduation would be enlightening. I do not have the sensitive data but my experience shows that most of them either go to services like IAS/IES or to the public sector companies. Normally this choice of careers by IIT graduates should be a matter of satisfaction except that both these entries are again using the reservation quota..."

If a Professor himself can't find the data while being inside the system, what is the hope of getting it from outside?

Thus, Professor has to write from his experience, "IITs have had reservations for SC/STs for decades. Why would this be different? Aren’t these students likely to be better prepared than the students admitted under the existing reserved category? Here I would like to share some of the facts with the readers. IITs have been admitting SC/ST students for years under two modes. From the general category, a significantly lower JEE cutoff is decided and reserved category students scoring above this cutoff are admitted directly to the UG programmes. Another still lower cutoff is decided and reserved category students from this set are admitted to a one year preparatory course conducted by IITs themselves. After passing this course, they can join the programmes without having to appear in JEE again. Even this exercise collectively yields less than 15% in IIT Delhi though the quota amounts to nearly 22.5%. Half of the reserved category students manage to clear courses comfortably while the other half struggle on the margins. What would be called a good performance (cumulative grade point average or CGPA of 8 and above) and is achieved by nearly forty percent of general category students, is rare and occurs once in many years among the reserved category students. It is not that all general category students do well. There is nearly a 5% “dropout” rate even among them which is a cause of concern but mainly attributed to the burnout due to JEE preparation phase..."

I couldn't find a copy of this note online. So, can't link to it.