Hey, 

You will have to apply for TNEA examination to get into Anna University. For students who are from other states, a special quota is reserved in case of seats. 

First, apply for TNEA. Application is available online in the official website. Ace the exam. Apply for the counselling. Satisfy the required eligibility criteria. Apply for counselling opting for the branch you're interested in. Get selected. 

Hope this helped you 

Thank you and keep asking :)