Dear Darsheetha,

First of all, you need to know in which Engineering course you are interested. This will help you to choose your stream accordingly .

But, as you have asked .. I can say now-a-days ..demand of  CSE /IT branches are increasing tremendously .

Well, some of the well known colleges which offers CSE/IT branches in Tamil Nadu are as follows,

1) IIT Madras

2) NIT, Trichy

3) VIT, Vellore

4)Anna University , Chennai

5) SRM University, Chennai

You can refer to this link to know more about these colleges such as fee structure , placement records.

https://engineering.careers360.com/colleges/ranking/top-engineering-colleges-in-tamil-nadu

Now, these following steps you can follow if you have given engg entrance test!

1) If you have given JEE main  exam, this  rank predictor will help you to know your ranking position .

2) After predicting your rank through the above  link , you can go for this college predictor link to search most appropriate stream as well as college for you as per your rank . You will get also total information about your preferred colleges through this link. To search for IITs  , you need to check jee advanced college predictor .

JEE Main college predictor: https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

JEE advanced College predictor: https://engineering.careers360.com/jee-advanced-college-predictor?icn=QnA&ici=qna_answer

3) You can filter the search by giving preferences .It's up to you whether your interested stream is in 1st preference or your preference is for colleges based on locations near you !

Hope it helps!

Best wishes !!