Just skimmed through the report on JEE-2011. It has all kinds of sociological data (though not fine-grained enough for us to perform our own analysis). Here's an interesting set of data on the candidates' parental income.
According to parental income
Table A13 shows the zone wise distribution of candidates according to annual income of parents. Out of the 468280 candidates who appeared, 146882 (31.36%) had a parental income of less than 1 Lakh. 195220 candidates (41.69%) had a parental income between 1-3 Lakhs. Another 19.3% have a parental income between 3-6 Lakhs, while 4.87% have parental income between 6-10 Lakhs. 12520 candidates (2.67%) have parental income exceeding 10 Lakhs. The percentages for qualified candidates for the five slabs of parental income are 17.1%, 31.7%, 30.47%, 11.86% and 8.86% respectively. The income slabs used in JEE 2010 data analysis was more or less similar. However it is observed that a large percentage of appeared as well as qualified candidates belong to the low to middle income groups.
The report doesn't tease out the implications on the income effect on JEE outcomes, but we certainly can. When we do that, we find a clear trend:
|Income||No. of JEE Takers||No. of JEE Qualifieds||Pass %|
|Less than 1 lakh||146882||2258||1.54|
|More than 10 lakhs||12520||1169||9.34|
In other words, a candidate from the top income slab is 6 times more likely to get through JEE than one from the lowest slab. This advantage is "only" 4 times when the comparison group is from the second lowest slab (which also has the largest number of candidates).