Hello,

Admission to AU is done merit based. If you have good percentage in 12th then you hold a high chance to get an admission in AU.

As you mentioned, you are non-tamilnadu student which doesn't effect in any way. You will belong to open category (OC) but rest of the process is same.

If you want to join any other college or university for engineering then you have to appear TNEA entrance exam.

Hope it helps!