Hello,

You haven't mentioned if you are enquiring about UG or PG course. We consider  that you are an Engineering aspirant in class 12th so you should be seeking admission to B.E/B.Tech. The admission to Engineering in Anna University and its affiliated colleges is done through TNEA counselling window. There are 539 government and constituent colleges, universities, self-financing engineering colleges under Anna University. You have to apply for TNEA admission, based on your marks in Mathematics, Physics and Chemistry merit list will be prepared and published. The eligible applicants need to apply for TNEA counselling and select the colleges and branches in which they are interested to get admission. This step is called online choice filling where you give preferences of the college and branch. Based on category, marks, preferences and seat availability a seat will be allotted to the candidate. If he/she is willing to accept the seat can do so by reporting in the allotted college, pay the fee and submit the documents. There is no need to apply separately for each college, you can choose as many colleges and branches you want but select only if you are interested in that particular college and branch.

Here is the link where you can find TNEA Counselling relevant details

https://engineering.careers360.com/articles/tnea-counselling