The Council of Architecture has not yet released NATA Mock Test. It will be released online and you can take this exam from home. Once it releases, the link will be available in the article. By clicking the link, and entering your credentials you can start the mock test. You can practice previous years' mock tests which was released by COA. Click on the below link to access the tests-
http://engineering.careers360.com/articles/nata-mock-test
This year NATA exam pattern is a bit different. There will be drawing part in the first section. Three drawing questions will be asked. In the second part, there will be questions from Physics, Chemistry and Mathematics, General Aptitude and logical reasoning. Prepare well for the drawing test, as it will test your drawing and creative ability, your thinking ability.