NATA 2015 Test centers can be seen at http://www.nata.in/public2015/Regions
NATA Test Centers are grouped together by Regions.Candidates, at the time of filling the form, are required to select a Region and ANY ONE of the test centers in that region will be RANDOMLY alloted to candidate.
The pageat above link allows you to view the available regions and test centers in different states.
Test centers are getting activated till 15th April 2015 and will be added to this list as soon as they are activated.
Students are advised to study this list carefully and identify the region where they want to give exam, before registering for NATA