• Tamil Nadu candidates, who have passed VIII, IX, X, XI and XII from Tamil Nadu are eligible to apply. They need not enclose nativity certificate.
•  Tamil Nadu native candidates, who have passed any of the VIII, IX, X, XI and XII or their equivalent examination from schools situated outside Tamil Nadu, can also apply. They should enclose a copy of nativity certificate only in electronic form/digitally signed e-certificate.
•  Children of central government employees may also apply for admission, irrespective of their native, provided their parents or guardians (only if both parents are not alive) have been serving in Tamil Nadu continuously for the past five years at the time of submission of application, which should be supported by enclosing a certificate from the employer of the parent or guardian, to that effect.
•  Sons and daughters of all India service Tamil Nadu cadre officers are eligible to apply.
•  Children of employees in public sector or government recognized institutions, who at the time of submission of application for admission employed in Tamil Nadu continuously for the past five years, may also apply irrespective of their domicile. A certificate from the employer has to be enclosed along with the application stating that the person is a permanent employee of the firm or institution concerned with evidence like income tax return, PF slips, etc. and is working in Tamil Nadu continuously for the past five years.
•  Other state candidates, who have studied in VIII, IX, X, XI and XII in Tamil Nadu are eligible to apply. They need not enclose nativity certificate.

If you are not native of tamil naidu you can apply In other state quota

For more information check the given link

https://engineering.careers360.com/tags/eligibility-criteria-anna-university