"The caste data should be released immediately, delaying it will not do any good for Other Backward Classes," he said.
He urged that the reservation for OBCs, Scheduled Castes and Tribes must be upwardly revised after consideration of the caste data.
"I urge the Centre to focus on formulating new schemes for their (OBCs, SCs, STs) socio-economic upliftment," the DMK chief said in a statement here.
Referring to the huge data on socio-economic status released by the Centre, he said, "We do not understand why they say that the data on caste will be tabled in Parliament when they have put out so much on socio-economic front."
PMK and Rashtriya Janata Dal have already demanded release of caste details of the Census, he said.