Engineering Entrance Exam

I am extremely sorry to say this but given your marks, you cannot get into DAIICT. The cut-off all India ranks are around 10000-12000 for ICT branch and 5000-6000 for ICT with a hons in CS and I can assume your rank is not in the limit required. I hope, you get a good college somewhere else.

PSG Coimbatore are better than SSN Chennai as you can compare it by the ranking difference gap between them(approx.25) and their placement record.

Not getting your question. But, the thing is, if your college is not decided, then search for colleges offering instrumentation course, which are less. COEP, VIT, Cummins etc. I know.

Hello Bhavana,
It's nice to see your enthusiasm for seeking admission for aeronautical engineering branch in Sathyabama. However, eligibility is their own entrance exam and some more and not JEE Mains. I am attaching a link that will give you all the required information:
https://www.sathyabama.ac.in/online_entrance_application_course.php

Hello,
Yes, it is good but this will benefit you only. When you score well in this JEE Mains and you could not qualify any IIT by less marks because if you start from scratch, then this will be tough for you to achieve well and you will cover long route to get IIT. Think twice and then choose.

You should score above 400 out of 600 to get admission in good government college.

JESNU merit rank list will be published by WBJEEB in the fourth week of June as per link https://www.google.co.in/amp/s/www.shiksha.com/b-tech/exams/amp/jesnu. It can come any time in this week.

Chandigarh University accepts your JEE score, and it is quite possible, you can get admission there.