Hey, 

You can get into Anna University through TANCET/TNEA/TANCET MBA/TANCET MCA. You need to apply for the above exam depending on the course which you are willing to study. After giving the exam, you should satisfy the admission criteria provided by the college which includes the cut offs and other requirements. If you satisfy all the above conditions, you can enter into Anna University. 

Hope this helped you. 

Thank you and keep asking :)