In order to appear for NATA, one must have passed their class XII exam with mathematics as a subject or have done diploma from a recognized university/institute/board with a minimum of 50% marks.
Candidates who are appearing for the NATA have to fill-in a pre-registration form which is obtainable at the official website. After that, the candidates will receive the receipt and the appointment verifier with details of the time and date from the Test Center. The fees of NATA are Rs.800, and they are to be paid either at the Registration time or before the collection of the appointment voucher. The test fees can be paid in cash or by DD drawn in favor of the Test Center.
A pre-registration form must be downloaded from the NATA website http://www.nata.in and filled in accordingly. After filling up the form with the requisite information, it should be printed and posted to NIASA along with the necessary attachments.
Hope this helps.